The clapperboard, also called a slate, became standard once sound film arrived in the late 1920s because the sharp clap gave editors a clear point to sync picture and separate audio. The board also holds written details like production, scene and take numbers that are read or shown before the action. Long associated with Hollywood sets, the sound spread through trailers, television features and online editing culture. Today creators use the brief snap far from real sets as a universal shorthand for filming, starting a take and moving into a new scene.