tessera

[ tes-er-uh ]

/ ˈtɛs ər ə /

one of the small pieces used in mosaic work.

a small square of bone, wood, or the like, used in ancient times as a token, tally, ticket, etc.

Origin of tessera

1640–50; < Latin < Greek (Ionic) tésseres four

And the tesserae do not fall out like those you bought on the Rialto.

Creative Chemistry |Edwin E. Slosson
And the earlier its date the more surely was it a mosaic, not in the form of tesserae, but in the manner known as “opus sectile.”

Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 1 |Various
Four tali were used at a time and they, like the tesserae, were generally thrown from a box, fritillus.

Cato Maior de Senectute |Marcus Tullius Cicero
The attention of archaeologists has been recently directed to the tesserae of gladiators.

Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 1 |Various

Each of these men who have gone the rounds (tessarii) at daybreak conveys the tesserae to the Tribune on duty.

The Histories of Polybius, Vol. I (of 2) |Polybius

tessera

/ (ˈtɛsərə) /

a small square tile of stone, glass, etc, used in mosaics

a die, tally, etc, used in classical times, made of bone or wood

tesseral, adjective

C17: from Latin, from Ionic Greek tesseres four