Tessera
a small cubical or other geometrical form of marble, earthenware, ivory, glass, etc., used for tessellated pavements, ornamenting walls, etc., colored tiles or bricks, usually cubical, laid in patterns, as a mosaic pavement. In antiquity, a small piece of wood, bone, or metal, used as a ticket of admission to the theaters in ancient Rome, or as a certificate given to gladiators, containing their names, that of the consul, and the day on which they had won their distinction in the circus.