Augmentative of slate . Name given to a waxed, flat, vertical and usually square or rectangular surface, where it is written or drawn with chalk or marker. It is reusable. Panel.
Plate with a waxed surface, originally of slate mineral, where you can write or draw and erase easily. It is usually of a sufficient size so that it can be seen several meters by a number of spectators, students, players, . . .