Clapperboard

[Dave Paprocki]

A pair of hinged boards that are struck together at the beginning of filming to synchronize the starting of picture and sound machinery.

[Zipporah Schumaker]

[The black] and white [board] used to mark [the scene] and take when creating a film.

[Gregory]

A device of hinged boards that are struck together before filming as a signal to synchronize the starting of picture and sound machinery.