Etymology
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tessera (n.)

plural tesserae, "small, square piece of stone," 1650s, from Latin tessera "a die, cube, square tablet with writing on it" used as a token or ticket, from Ionic Greek tessera, neuter of tesseres (Attic tessares) "the numeral four" (from PIE root *kwetwer- "four").

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Definitions of tessera

tessera (n.)
a small square tile of stone or glass used in making mosaics;
From wordnet.princeton.edu