im trying to convert a c demo and im stuck. heres the code (just 1 line)

Code:
nozzleDampForce = - (nozzleVeloc % nozzleDir) * mass * nozzleDampCoef;

ive never seen a % in code before so i dont know what to do with it.

this is how the delphi code is looking so far

[pascal]LNozzleDampForce := -{(LNozzleVelocity % LNozzleDirection) *} Hovercraft.Mass * LNozzleDampCoef;[/pascal]

LNozzleVelocity, LNozzleDirection are Vectors (array[0..2] of Single) and Hovercraft.Mass, LNozzleDampForce and LNozzleDampCoef are singles.

any help is great as im pulling my hair out over this