What was the name of the blackboard in the director's hand when he called to stop?

When the director stops, the blackboard in his hand is called the scoreboard.

Note board introduction: black or white board can be written with whiteboard pen or water-based marker pen and chalk, which is simple, practical and clearly visible. Hardwood, it's so loud. A small wooden board with the number of times, scenes, director, film title, film company and other information written on it. One end can be opened and closed to make a clear sound, so that the sound and picture are synchronized when editing.