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This is a list of the most frequently used abbreviations. Arranged alphabetically.

For the most frequently asked questions, go here.

AFK Away from keyboard
ASOG A Shortfall of Gravitas One of SpaceX's drone ships, the newest of the fleet.
AU Aurum / gold, or AUricle; our moderator
BRB Be right back
BN Booster Number Used to identify a particular Super Heavy booster
CH4 Methane
COPV Composite Overwrapped Pressure Vessel
Cryo Cryogentic testing
Cya See ya
DM Direct message Usually using discord
F9 Faclon 9 SpaceX's primary medium-lift rocket
FH Falcon Heavy The heavy-lift varient of Falcon 9
GM Good morning
GN Good night
GSE Ground Support Equipment
GTG Got to go
HB High Bay
HE Helium
JRTI Just Read The Instructions One of SpaceX's drone ships
KSP Kerbal Space Program
LEO Low Earth Orbit
LN2 Liquid Nitrogen
LOX Liquid Oxygen
MB Mid Bay
MS Mass Simulator
NOTAM Notice to Airmen
NP No Problem
OCISLY Of Course I Still Love You One of SpaceX's drone ships
OLP Orbital Launch Pad
QD Quick Disconnect
RUD Rapid Unscheduled Disassembly An event that happens very quickly resulting in something being destroyed without warning (also referred to as 'anomaly', or more to the point: 'an explosion')
RSN Raptor Serial Number Used to identify a particular Raptor Engine
RP-1 Rocket Propellant-1 A refined grade of Kerosene used as fuel for some rockets, like Falcon 9
SF Static Fire
SH Super Heavy
SHB Super High Bay This abbreviation is out of use now
SL Starlink
SN Serial Number Used to identify a particular StarShip (or Raptor Engine)
SPI South Padre Island
SS StarShip
SSTO Single Stage to Orbit
TFR Temporary Flight Restriction
TS1 Test Stand 1 Named "Suborbital Pad A" by SpaceX
TS2 Test Stand 2 Named "Suborbital Pad B" by SpaceX
WDK We don't know
WDR Wet Dress Rehearsal
YT YouTube
YW You're welcome