Cogwheels of different types and sizes.
a wheel with a rim notched into teeth, which mesh with those of another wheel or of a rack to transmit or receive motion
- A toothed wheel.
- One of a set of cogged wheels within a mechanism.
- A gear wheel
- (When used attributively) Something behaving in similar, jerky, manner as a cogwheel, e.g. cogwheel respiration as a side effect of hyperbaric medicine