perforations; sprocket holes
Technical term for the holes along the edge of film or paper tape used for transport or synchronization. Common in photography, film projection, and early computing contexts.
If the film's perforations are torn, it cannot be played back properly on a projector.
Compound of 送り (okuri, 'feeding, advancing') and 穴 (ana, 'hole'). The term directly describes the function of these holes in film or tape transport mechanisms.