Hier mal ein paar Abkürzungen, die immer wieder überall in Artikeln/Foren beim Reden über Shuttleflüge verwendet werden:

STS = Space Transportation System
ET = External Tank
OV = Orbiter Vehicle (such as OV-103 is Discovery, 04 is Atlantis, O5 is Endeavour)
SRB = Solid Rocket Booster
OMS = Orbital Maneuvering System
RCS = Reaction Control System
MPL = Mobile Launch Platform (Rides on the Crawler Transporter, Shuttle Stack goes on top of the MLP).
VAB = Vehicle Assembly Building
MECO = Main Engine Cut Off
SSME = Space Shuttle Main Engine
MAF = Michoud Assembly Facility
MSFC = Marshall Space Flight Center
KSC = Kennedy Space Center
RLV = Reusable Launch Vehicle
LOX = Liquid Oxygen
LH2 = Liquid Hyrogen
ECO = Engine Cut Out (sensor)