This article is from the Star Trek Tech FAQ, by Joshua Bell inexorabletash@hotmail.com with numerous contributions by others.
c
Speed of Light ( ~= 3 x 10^8 m/s )
FTL
Faster Than Light (usually communication or travel)
warp
One method of FTL travel used in Star Trek, in which nested
subspace fields create a propulsive effect.
Warp
"Unit" for warp factor, as opposed to the technology.
 
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