A sprag clutch is a one-way freewheel clutch. It resembles a roller bearing but, instead of cylindrical rollers, non-revolving asymmetric figure-eight shaped sprags, or other elements allowing single direction rotation, are used.

What does Sprag mean?

: a pointed stake or steel bar let down from a halted vehicle (such as a wagon) to prevent it from rolling.

What is a sprog in England?

sprog in British English

(sprɒɡ ) noun British slang. a child; baby. (esp in the RAF) a recruit.