ratchet wheel

ratchet wheel

noun
a wheel, with teeth on the edge, into which a pawl drops or catches, as to prevent reversal of motion or convert reciprocating motion into rotatory motion.

Origin:
1770–80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Ratchet wheel is always a great word to know.
So is gobo. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
WordNet
ratchet wheel

noun
toothed wheel held in place by a pawl or detent and turned by a lever 
WordNet® 3.0, © 2006 by Princeton University.
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