Abbreviations and acronyms

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This page lists many abbreviations, acronyms and initialisms that are used frequently to communicate more quickly, but can confuse new players or players who are not familiar with them.

Ap
Apoapsis, highest point in an orbit.
B9
B9 Aerospace addon
CM
Command Module, a transfer ship that delivers a Lander Module to orbit around some body, then waits there and takes it completely or only the crew home again. Not to be confused with command modules.
DRE
Deadly ReEntry - an addon, simulates the atmospheric entry heat effects.
dV, Δv
Delta-V, a measure of the ship's propulsive energy.
FAR
Ferram Aerospace Research - an addon, gives realistic aerodynamics.
GUI
Graphical User Interface
HKO
High Kerbin Orbit
HSC
Hitchhiker Storage Container - The a PPD-10 Hitchhiker Storage Container
ISP, Isp, Isp
Specific impulse, more accurately Isp but that's hard to do on the forum. A value where the higher one is more fuel efficient.
KAS
Kerbal Attachment System - an addon, gives a kind of attachment system, wraps and containers...
KER
Kerbal Engineer Redux - a diagnostic addon
KIDS
Kerbal Isp Difficulty Scaler - addon for more realistic Isp.
KMP
Kerbal MultiPlayer - Multiplayer addon.
KSP
Kerbal Space Program!
KSC
Kerbal Space Center
LES
Launch Escape System
LFB
Liquid Fuel Booster - like the LFB KR-1x2.
LKO
Low Kerbin Orbit
LM
Lander Module, paired with a Command Module and which lands on the body.
LMC
Left-Mouse-Click
Pe
Periapsis, lowest point in an orbit.
RCS
Reaction Control System
RSS
Real Solar System - an addon with solar system of our size...
RTG
Radioisotope Thermoelectric Generator
RUD
Rapid, Unplanned Disassembly. Usually happens when there are not enough struts or it collides with something. See also catastrophic failure.
SoI
Sphere of influence, which are the frames of reference. The trajectory in the current sphere of influence is shown blue on the map view.
SA
Sub-Assembly (in VAB/SPH)
SAS
Stability Augmentation System or (jokingly) Sickness Avoidance System
SMA
Semi-Mayor Axis
SPH
Space Plane Hangar
SRB
Solid Rocket Booster
SSTO
[Single-stage-to-orbit
TSTO
Two-stage-to-orbit
TVC
Thrust Vector Control
VAB
Vehicle Assembly Building
VTOL
Vertical take off and landing

See also