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This list contains definitions for [[Orbiter]] or important [[spaceflight]] acronyms or abbreviations, especially those appearing in [[MFD|MFDs]] and various [[HUD]] modes.
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* AF -
 
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* AgP - [[argument of periapsis]]
One entry in this list consists of a term with one or more definitions, like:
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* AN - [[ascending node]]
 
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* ApA - [[apoapsis]] altitude
;Term:Definition
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* ApD - [[apoapsis]] distance
<pre>
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* ApR - [[apoapsis]] radius
;Term:Definition
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* ApT - time to [[apoapsis]]
</pre>
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* Alt - [[altitude]]
 
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* atmo - [[atmosphere]]
Don't use links in the term part of a entry, please do so in the definition part, for keeping a consistent look-and-feel and don't putting to much emphasis on a single definition.
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* AU - [[astronomical unit]]
 
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* CDI - [[course deviation indicator]]
Terms without definitions will get moved to the talk page into the section "Wanted definitions". If you have multiple definitions for a term, the definition part should turn into a numbered list, like:
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* CDR - commander
;Term:
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* [[CEV]] - Crew Expedition Vehicle
#Definition 1
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* COM - communication or communicator
#Definition 2
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* CTRL - Control
#Definition 3
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* CVEL - [[closing velocity]]
 
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* CVEL - Common Vessel Extensions Light, see [[CVEL]]
<pre>
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* DN - [[descending node]]
;Term:
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* DG - [[Delta-glider]]
#Definition 1
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* DG-S [[Delta-glider]] equiped with two [[scramjet|scramjets]].
#Definition 2
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* DIV - [[divergent]], i.e. [[yaw]] [[gimbal]] mode.
#Definition 3
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* Dir - direction
</pre>
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* Dist - distance
 
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* DLng - longitude difference, as seen on the [[synchronise orbit MFD]]
The order of the definitions should be like that:
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* DNP - dynamic [[pressure]]
#Orbiter HUD definitions
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* DNS - atmospheric density
#Orbiter MFD definitions
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* DST or Dst - distance (to target)
#General Orbiter definitions
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* DTe - time to [[ejection]], as seen on the [[transfer MFD]]
#Orbiter [[Add-on]] definitions
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* DTi - time to intercept, as seen on the [[transfer MFD]]
#General spaceflight definitions
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* DTmin - time of arrical difference, as seen on the [[synchronise orbit MFD]]
 
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* Dv - delta [[velocity]], as seen on the [[transfer MFD]]
If you don't agree to a ordering of definitions, please complain in the [[Talk:List_of_Acronyms_and_Abbreviations|talk]] page about the entry.
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* Ecc - [[eccentricity]]
 
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* ECL - plane of the [[ecliptic]]
==See also==
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* ESA - [[European Space Agency]]
 
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* ET - [[external tank]]
* [[Russian glossary]]
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* EQU - plane of the [[equator]]
* [[List of Acronyms and Abbreviations/ISS|List of Acronyms and Abbreviations for the ISS]]
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* [[EVA]] - Extra vehicular activity
 
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* FGB - russian acronym for Functional Cargo Block. See [[FGB]]
----
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* FoV - field of view, as seen in the [[general information display]]
{{compactTOC}}
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* FPS - [[frame rate]], as seen in the [[general information display]]
 
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* G - an unit of acceleration. 1 G equals the gravity acceleration on earths surface, 9.81 m/s²
=A=
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* GL - [[Delta-glider]]
;AgP:[[Argument of periapsis]]:The angle in the orbit from the point of the ascending node to the point of periapsis, Used in OrbitMFD.
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* GS - [[ground speed]]
;AN:[[ascending node]]:a vector in an orbit where the body passes from south to north of the plane of reference (i.e. ecliptic or equatorial). Shown in OrbitMFD as a dotted vector line connecting to a solid square on the orbit.
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* GMT - Greenwich Mean Time.See UT [http://en.wikipedia.org/wiki/Universal_Time]
;ApA:[[apoapsis]] apoapsis altitude
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* H - Horizon
;ApD:[[apoapsis]] apoapsis distance
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* HLLV - heavy lift launch vehicle
;ApR:[[apoapsis]] apoapsis radius
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* HUD - [[heads up display]]
;ApT:time to [[apoapsis]]
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* HSI - [[horizontal situation indicator]]
;Alt:[[altitude]]
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* HST - [[Hubble Space Telescope]]
;AORP:'''A'''utonomous '''O'''rbiter '''R'''apid '''P'''rototype, a system to allow a [[STS|shuttle]] orbiter to land without [[crew]].
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* HTO - [[hypothetical orbit]], as seen on the [[transfer MFD]]
;atmo:[[atmosphere]]
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* IAS - indicated air speed [http://en.wikipedia.org/wiki/Indicated_air_speed]
;AR:'''a'''cceptance '''r'''eview
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* IDS - [[instrument docking system]]
;ATV:
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* ILS - [[instrument landing system]]
#'''A'''utonomous '''T'''ransfer '''V'''ehicle, an unmanned cargo spacecraft, see [[ATV]].
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* Inc - Inclination
#'''A'''utomated '''T'''ransfer '''V'''ehicle[http://www.orbiterwiki.org/wiki/ATV#The_ATV]
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* ISP - specific impulse
;AU:[[astronomical unit]]
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* ISS - [[International Space Station]]
 
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* JD - julian date
=B=
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* KISS - "Keep it simple, stupid!" Famous engineering dogma.[http://en.wikipedia.org/wiki/KISS_principle]
;BMW:'''B'''ate, '''M'''ueller, '''W'''hite - authors of ''Fundamentals of Astrodynamics'' (1971)
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* KSC - [[Kennedy Space Center]]
 
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* LAN - longitude of [[ascending node]] or local-area network
=C=
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* LDEF - [[Long Duration Exposure Facility]]
;CaLV:'''Ca'''rgo '''l'''aunch '''v'''ehicle, see [[Ares V]]
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* LEO - [[Low earth orbit]]
;CDI:[[course deviation indicator]]
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* LPe - longitude of [[periapsis]]
;CDR:
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* m - metre
#commander
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* M - Mega (SI prefix). Occasionally mass or [[mach]] number
#'''c'''ritical '''d'''esign '''r'''eview
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* MCC - mid course correction
;CEV:'''C'''rew '''e'''xpedition '''v'''ehicle, see [[CEV]]
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* MECO - Main Engine Cutoff
;CFD:computational fluid dynamics
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* [[MFD]] - multifunction display
;CLV:'''C'''rew '''l'''aunch '''v'''ehicle, see [[Ares I]]
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* MJD - [[modified julian date]]
;COAS:'''C'''rew '''O'''ptical '''A'''lignment '''S'''ight
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* [[MMU]] - Manned Maneuvering Unit
;COM:communication or communicator
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* MnA - [[mean anomaly]]
;CTD:[[crash to desktop]]
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* MnL - [[mean longitude]]
;CTRL:Control
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* MSx - Mission Specialist x
;CTV:
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* m/s - meters per second, the SI base unit of [[velocity]]
#'''C'''rew '''T'''ransfer '''V'''ehicle, a manned spacecraft derived from the [[ATV]], see [[CTV]]
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* NAV - navigation or [[navigation aid]]
#'''C'''ompatibility '''T'''est '''V'''an, '''NASA'''
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* OAT - outside air temperature
;CVEL:
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* Ob - obliquity of ecliptic (tilt of axis of rotation against plane of ecliptic)
#[[closing velocity]]
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* OBS - [[omni bearing selector]]
#'''C'''ommon '''V'''essel '''E'''xtensions '''L'''ight, see [[CVEL]]
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* OBT - [[orbit]], as seen on the [[orbit MFD]]
 
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* OMS - orbital maneuvering system, the 'main engines' of the orbital [[space shuttle]]
=D=
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* OS - [[orbital speed]]
;D3D9:refers to the advanced graphics client in [[Orbiter]].
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* P - position (sometimes radius) vector, as seen on the [[align orbital plane MFD]]
;DN:[[descending node]]
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* p0 - atmospheric pressure at sea level
;DDT&E:'''d'''esign, '''d'''evelopment, '''t'''est and '''e'''valuation
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* PAPI - Precision Approach Path Indicators, lit runway centreline.
;DG:[[Delta-glider]]
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* PB -
;DGIII:[[DeltagliderIII]], a famous enhanced version of the [[Delta-glider]].
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* PeA - [[periapsis]] altitude
;DGIV:[[DeltaGliderIV]], an improved version of the [[DeltaGliderIII]].
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* PeD - [[periapsis]] distance
;DG4:Orbiter's stock '''DG'''
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* PeR - [[periapsis]] radius
;DG-S:[[Delta-glider]] equiped with two [[scramjet|scramjets]].
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* PG - [[prograde]]
;DIV:[[divergent]], i.e. [[yaw]] [[gimbal]] mode.
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* PLT - Pilot
;Dir:'''dir'''ection
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* Pos - position
;Dist:'''dist'''ance
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* PRJ - [[projection]], as seen on the [[orbit MFD]]
;DLng:longitude difference, as seen on the [[synchronise orbit MFD]]
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* PSx - Payload Specialist x
;DNP:dynamic [[pressure]]
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* R - mean radius or specific gas constant
;DNS:atmospheric density
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* r0 - atmospheric density at sea level
;DPS:'''D'''ata '''P'''rocessing '''S'''ystem. Term describing the general purpose computers and their interfaces onboard various manned spacecraft.
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* Rad - radial distance (not to be confused with angular unit ''radians'')
;DST or Dst:distance (to target)
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* RAnm - [[true anomaly]] of reference axis, as seen on the [[synchronise orbit MFD]]
;DTe:time to [[ejection]], as seen on the [[transfer MFD]]
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* Rate - rate of change, as seen on the [[align orbital plane MFD]]
;DTi:time to intercept, as seen on the [[transfer MFD]]
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* RCS - [[reaction control system]], spacebourne orientation rocket system.
;DTmin:time of arrical difference, as seen on the [[synchronise orbit MFD]]
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* RInc - [[relative inclination]], as seen on the [[align orbital plane MFD]]
;Dv:delta [[velocity]], as seen on the [[transfer MFD]], see also [[Delta-V]]
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* RVel - relative [[velocity]]
 
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* RG - [[retrograde]]
=E=
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* RKA - Russian Space Agency
;Ecc:[[eccentricity]]
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* RMS - Remote Manipulator System
;ECL:plane of the [[ecliptic]]
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* SDLV - Shuttle Derived Launch Vehicle
;ECSS:'''e'''uropean '''c'''ooperation for '''s'''pace '''s'''tandardization
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* SECO - Secondary Engine Cutoff
;ECLSS:'''E'''nvironmental '''c'''ontrol and '''l'''ife '''s'''upport '''s'''ystem
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* Sim - simulation time (in seconds), as seen in the [[general information display]] or a common abbreviation for "simulator"
;EELV:Evolved Expendable Launch Vehicle
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* SHP - [[ship]], as seen on the [[orbit MFD]]
;ESA:[[European Space Agency]]
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* Sh-ToR - ship [[time-on-reference]], as seen on the [[synchronise orbit MFD]]
;ESAS:[[w:Exploration Systems Architecture Study|Exploration Systems Architecture Study]]
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* SLF - shuttle landing facility, see [[Cape Canaveral]]
;ET:[[external tank]]
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* SMa - [[semi-major axis]]  
;EQU:plane of the [[equator]]
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* SSME - Space Shuttle Main Engines [http://en.wikipedia.org/wiki/SSME_%28rocket_engine%29]
;EVA:'''E'''xtra '''v'''ehicular '''a'''ctivity, see [[EVA]]
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* SMi - [[semi-minor axis]]
 
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* SRB - Solid Rocket Booster
=F=
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* SSTO - [[Single_Stage_To_Orbit | Single Stage to Orbit]]
;FGB:Russian abbreviation for Functional Cargo Block. See [[FGB]]
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* STP - static [[pressure]] or [[Stone Temple Pilots]]
;FoV:field of view, as seen in the [[general information display]]
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* STS - space transportation system, [[space shuttle]]
;FPS:[[frame rate]] (frames per second), as seen in the [[general information display]]
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* Tgt - target, esp. in [[docking]] mode
;FRF:'''F'''light '''R'''eadiness '''F'''iring, a launch countdown test of the Shuttle running all except SRB ignition and lift-off.
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* Tg-ToR - target [[time-on-reference]], as seen on the [[synchronise orbit MFD]]
 
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* T - orbit period, measured in seconds
=G=
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* TAS - true air speed [http://en.wikipedia.org/wiki/True_air_speed]
;g:a unit of acceleration. 1g equals the gravity acceleration on earths surface, 9.81 m/s²
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* TKS - russian spacecraft for the Almaz program, see [[TKS]]
;GL:Used often as vehicle name prefix for a [[Delta-glider]]
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* TLE - two-line elements
;GET:'''G'''round '''E'''lapsed '''T'''ime [http://history.nasa.gov/SP-4029/Apollo_00c_Introduction.htm]
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* TLe - eject longitude, as seen on the [[transfer MFD]]
;GLOC:'''G'''ravity-induced '''L'''oss '''o'''f '''C'''onsciousness 
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* TLi - intercept longitude, as seen on the [[transfer MFD]]
;GMT:Greenwich Mean Time.See [[w:Universal Time|Universal Time on Wikipedia]]
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* TLI - Trans Lunar Injection
;GPDS:[[GPDS|Generic Payload Description System]]
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* Tn - time to node, as seen on the [[align orbital plane MFD]]
;GPS:'''G'''lobal '''P'''ositioning '''S'''ystem
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* TOFS - tangential offset [[docking MFD]]
;GS:[[ground speed]]
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* TrA - [[true anomaly]]
;GTO:[[GTO|'''g'''eostationary '''t'''ransfer '''o'''rbit]]
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* TrL - [[true longitude]]
 
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* Ts - length of siderial day
=H=
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* Tth - predicted thrust time, as seen on the [[align orbital plane MFD]]
;H:Horizon
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* TVEL - tangential [[velocity]]
;HAC:[[Heading Alignment Cone]]
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* UT - universal time, GMT. Not to be confused with UTC (Universial Time Co-ordinated). The latter is based on atomic clocks not astronomy, hence the occasional ''leap-second'' to correct UTC to GMT.
;HLLV:'''h'''eavy '''l'''ift '''l'''aunch '''v'''ehicle
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* VASI - Visual Approach Slope Indicator, the glideslope lighting system ajacent to runways to guide pilots onto the correct angle of glideslope (normally 3 degrees).
;HUD:[[heads up display]]
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* VC - virtual cockpit
;HSI:[[horizontal situation indicator]]
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* Vel - [[velocity]]
;HST:[[Hubble Space Telescope]]
+
* VOR - [[very high frequency omnidirectional radio]]
;HTO:[[hypothetical transfer orbit]], as seen on the [[transfer MFD]]
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* VS - vertical speed
 
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* VTOL - Vertical Take Off and Landing
=I=
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* STOVL - Short take-off, vertical landing. As performed by the DG on full fuel employing hover thrusters during takeoff.
;IAS:indicated air speed [http://en.wikipedia.org/wiki/Indicated_air_speed]
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* Wrp - time acceleration factor, seen in the [[general information display]]
;IDS:[[instrument docking system]]
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* XPDR - [[transponder]]
;ILS:
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* ZM - zoom, as seen on the [[map MFD]]
#[[instrument landing system]]
 
#'''I'''nternational '''l'''aunch '''s'''ervices, a US-russian joint venture marketing [[Atlas]] and [[Proton]] launches
 
;Inc:Inclination (http://en.wikipedia.org/wiki/Inclination)
 
;ISP:[[specific impulse]]
 
;ISS:[[International Space Station]]
 
 
 
=J=
 
;JD:[[Julian date]]
 
;JWST:'''J'''ames '''W'''ebb '''S'''pace '''T'''elescope
 
;JSC:  Lyndon B. '''J'''ohnson '''S'''pace '''C'''enter
 
 
 
=K=
 
;KISS:"Keep it simple, stupid!" Famous engineering dogma.[http://en.wikipedia.org/wiki/KISS_principle]  
 
;KSC:[[Kennedy Space Center]]
 
 
 
=L=
 
;LAN:longitude of [[ascending node]] or local-area network
 
;LCC:
 
#'''l'''aunch '''c'''ontrol '''c'''enter
 
#'''l'''ife '''c'''ycle '''c'''ost
 
;LDEF:[[Long Duration Exposure Facility]]
 
;LEO:[[Low earth orbit]]
 
;LH2:Liquid Hydrogen
 
;LOCV: Loss of crew and vehicle
 
;LOX:Liquid Oxygen
 
;LPe:longitude of [[periapsis]]
 
 
 
=M=
 
;m:metre
 
;M:Mega (SI prefix for 10<sup>6</sup>). Occasionally mass or [[mach]] number
 
;MCC:
 
#'''m'''id '''c'''ourse '''c'''orrection
 
#'''m'''ission '''c'''ontrol '''center'''
 
;MCC-H:'''m'''ission '''c'''ontrol '''c'''enter '''H'''ouston
 
;MCC-M:'''m'''ission '''c'''ontrol '''c'''enter '''M'''oscow
 
;MDR:'''m'''ission '''d'''efinition '''r'''eview
 
;MECO:'''m'''ain '''e'''ngine '''c'''ut'''o'''ff
 
;MET:'''M'''ission '''E'''lapsed '''T'''ime. See [[w:Mission Elapsed Time|Mission Elapsed Time on Wikipedia]].
 
;MFD:multifunction display, see [[MFD]]
 
;MJD:[[modified Julian date]]
 
;MLP:[[Mobile Launcher Platform]]
 
;MMOD:'''M'''icro'''m'''eteorites and '''o'''rbital '''d'''ebris
 
;MMU:'''m'''anned '''m'''aneuvering '''u'''nit, see [[MMU]]
 
;MnA:[[mean anomaly]]
 
;MnL:[[mean longitude]]
 
;MSx:Mission Specialist x
 
;m/s:meters per second, the SI base unit of [[velocity]]
 
 
 
=N=
 
;NAV:
 
#navigation
 
#[[navigation aid]]
 
 
 
=O=
 
;OAT:outside air temperature
 
;Ob:obliquity of ecliptic (tilt of axis of rotation against plane of ecliptic)
 
;OBS:[[omni bearing selector]]
 
;OBT:[[orbit]], as seen on the [[orbit MFD]]
 
;OMBUU: '''O'''rbiter '''M'''id'''b'''ody '''U'''mbilical '''U'''nit
 
;[[OMP]]:'''O'''rbiter '''M'''ultiplayer '''P'''roject, an ongoing program to create a multiplayer server in Orbiter.
 
;OMS:'''O'''rbital '''M'''aneuvering '''S'''ystem, the 'main engines' of the [[space shuttle]] orbiter
 
;OS:[[orbital speed]]
 
 
 
=P=
 
;P:position (sometimes radius) vector, as seen on the [[align orbital plane MFD]]
 
;p0:atmospheric pressure at sea level
 
;PAM:'''P'''ayload '''A'''ssist '''M'''odule, a family of solid upper stages for the [[Space Shuttle]]
 
;PAPI:'''P'''recision '''A'''pproach '''P'''ath '''I'''ndicators, lit runway centerline.
 
;PB:[[Shuttle PB]]
 
;PDR:'''p'''reliminary '''d'''esign '''r'''eview
 
;PDRS:'''P'''ayload '''D'''eployment and '''R'''etrieval '''S'''ystem, the official name of the robot arm of the Space Shuttle
 
;PRR:'''p'''reliminary '''r'''equirements '''r'''eview
 
;PeA:[[periapsis]] altitude. Altitude of periapsis above the surface of the orbited body
 
;PeD:[[periapsis]] distance. See PeR.
 
;PeR:[[periapsis]] radius. Distance of periapsis from the center of the orbited body
 
;PeT:time to [[periapsis]] in seconds.
 
;PG:[[prograde]]
 
;PLT:Pilot
 
;PMI:'''P'''rincipal '''m'''oments of '''i'''nertia, see [[PMI]]
 
;Pos:position
 
;PRJ:[[projection]], as seen on the [[orbit MFD]]
 
;PSx:Payload Specialist x
 
 
 
=Q=
 
;QR: '''q'''ualification '''r'''eview
 
 
 
=R=
 
;R:
 
#mean radius
 
#specific gas constant
 
;r0:atmospheric density at sea level
 
;Rad:
 
#radial distance
 
#angular unit ''radians''
 
;RAnm:[[true anomaly]] of reference axis, as seen on the [[synchronise orbit MFD]]
 
;RCS:[[reaction control system]], spacebourne orientation rocket system.
 
;R&D:'''r'''esearch and '''d'''evelopment
 
;RDT&E:'''r'''esearch, '''d'''evelopment, '''t'''esting and '''e'''valuation
 
;RInc:[[relative inclination]], as seen on the [[align orbital plane MFD]]
 
;RVel:relative [[velocity]]
 
;RG:[[retrograde]]
 
;RKA:Russian Space Agency
 
;RMS:'''R'''emote '''M'''anipulator '''S'''ystem
 
;RS:Russian-side, used as prefix for orientation when describing ISS components.
 
;RSLS:'''R'''edundant '''s'''et '''l'''aunch '''s'''equencer, the computer systems responsible for the ignition of the SSMEs in the [[Space Shuttle]] orbiter.
 
;RTFM:'''R'''ead '''t'''he '''f'''ine (or many other '''f'''-words) '''m'''anual, a typical forum answer for questions already answered extensivly in the manual.
 
;RTLS:'''R'''eturn '''t'''o '''l'''aunch '''s'''ite, a [[Space Shuttle]] abort mode.
 
 
 
=S=
 
;SAR:
 
#'''S'''earch '''a'''nd '''r'''escue.
 
#'''S'''yntetic '''a'''perture '''r'''adar, a [[radar]] mode used for creating navigation maps or detect slowly moving ground vehicles.
 
;S/C: [[spacecraft|'''s'''pace'''c'''raft]]
 
;SDK:Software Development Kit [http://en.wikipedia.org/wiki/SDK]
 
;SDLV:'''S'''huttle '''D'''erived '''L'''aunch '''V'''ehicle, see [[Ares]]
 
;SDHLV:'''S'''huttle '''D'''erived '''H'''eavy '''L'''aunch '''V'''ehicle, see [[Ares V]]
 
;SECO:
 
#'''S'''econdary '''E'''ngine '''C'''ut'''o'''ff
 
#'''S'''ustainer '''E'''ngine '''C'''ut'''o'''ff
 
;Sim:
 
#simulation time (in seconds), as seen in the [[general information display]]
 
#a common abbreviation for "simulator"
 
;SHP:[[ship]], as seen on the [[orbit MFD]]
 
;Sh-ToR:ship [[time-on-reference]], as seen on the [[synchronise orbit MFD]]
 
;SI unit: The metric system of measurement, the modern name, see [[SI unit]]
 
;SLF:shuttle landing facility, see [[Cape Canaveral]]
 
;SMa:[[semi-major axis]]
 
;SSME:Space Shuttle Main Engines [http://en.wikipedia.org/wiki/SSME_%28rocket_engine%29]
 
;SMi:[[semi-minor axis]]
 
;SRB:'''S'''olid '''R'''ocket '''B'''ooster [http://en.wikipedia.org/wiki/Solid_rocket_booster]
 
;SRTM:'''S'''huttle '''r'''adar '''t'''opography '''m'''ission, see [[SRTM]].
 
;SSTO:[[Single_Stage_To_Orbit | Single Stage to Orbit]]
 
;STOVL:Short take-off, vertical landing. As performed by the DG on full fuel employing hover thrusters during takeoff.
 
;STP:static [[pressure]]
 
;STS:'''s'''pace '''t'''ransportation '''s'''ystem, AKA space shuttle, see [[space transportation system]]
 
 
 
=T=
 
;Tgt:target, esp. in [[docking]] mode
 
;Tg-ToR:target [[time-on-reference]], as seen on the [[synchronise orbit MFD]]
 
;T:orbit period, measured in seconds
 
;TAS:true air speed [http://en.wikipedia.org/wiki/True_air_speed]
 
;TAEM:Terminal Area Energy Management
 
;TEI:'''T'''rans '''E'''arth '''I'''njection[http://en.wikipedia.org/wiki/Trans_Earth_Injection]
 
;TKS:russian spacecraft for the Almaz program, see [[TKS]]
 
;TLA:Three letter acronym for a '''t'''hree '''l'''etter '''a'''cronym.
 
;TLE:two-line elements
 
;TLe:eject longitude, as seen on the [[transfer MFD]]
 
;TLi:intercept longitude, as seen on the [[transfer MFD]]
 
;TLI:Trans Lunar Injection
 
;Tn:time to node, as seen on the [[align orbital plane MFD]]
 
;TOFS:tangential offset [[docking MFD]]
 
;TrA:[[true anomaly]]
 
;TRK:Track ship, as displayed by [[map MFD]]
 
;TrL:[[true longitude]]
 
;TRL:'''t'''echnology '''r'''eadiness '''l'''evel
 
;Ts:length of siderial day
 
;Tth:predicted thrust time, as seen on the [[align orbital plane MFD]]
 
;TVEL:tangential [[velocity]]
 
 
 
=U=
 
;UMMU:'''U'''niversal '''m'''anned '''m'''aneuvering '''u'''nit, popular add-on, see [[Universal MMU]].
 
;UNKS:unknown problems, you are aware of.
 
;UNK-UNKS:unknown problems, you are not aware of.
 
;UT:'''u'''niversal '''t'''ime, GMT. Not to be confused with [[UTC]] (Universial Time Co-ordinated). The latter is based on atomic clocks not astronomy, hence the occasional ''leap-second'' to correct UTC to GMT.
 
 
 
=V=
 
;VASI:'''V'''isual '''A'''pproach '''S'''lope '''I'''ndicator, the glideslope lighting system ajacent to runways to guide pilots onto the correct angle of glideslope (normally 3 degrees).
 
;VC:
 
#virtual cockpit
 
#Visual C++, an IDE and C++ compiler by Microsoft.
 
;Vel:[[velocity]]
 
;VOR:[[very high frequency omnidirectional radio]]
 
;VS:vertical speed
 
;VSA: [[Virtual Space Agency]]
 
;VTOL:'''V'''ertical '''T'''ake '''O'''ff and '''L'''anding
 
 
 
=W=
 
;WBS:'''w'''ork '''b'''reakdown '''s'''tructure
 
;WPD:'''w'''ork '''p'''ackage '''d'''escription
 
;Wrp:time acceleration factor, seen in the [[general information display]]
 
=X=
 
;XPDR:[[transponder]]
 
=Y=
 
;YSC:Yokohama Science Center
 
=Z=
 
;ZM:zoom, as seen on the [[map MFD]]
 
 
 
{{compactTOC}}
 
 
 
[[Category: Articles]]
 
[[Category:Glossary]]
 

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