lolz
It's part of a CFrame, it tells which way it's pointing
[cframe].lookVector
here's its two most common uses
[part].Velocity = [part].CFrame.lookVector*[speed]
makes [part] fly at [speed] in the direction it's facing
pos = [part].Position + [part].CFrame.lookVector*[distance]
makes [pos] equal to a potition [distance] studs in front of [part] |