Tessera

Tesserae of a mosaic of doves drinking at a golden basin, 1st century AD, National Archaeological Museum, Naples, Italy

A tessera (plural: tesserae, diminutive tessella) is an individual tile, usually formed in the shape of a square, used in creating a mosaic. It is also known as an abaciscus or abaculus.

The unique illuminating effect of golden tesserae, Cappella Palatina in Palermo, Sicily, 12th century
A mosaic made from tesserae in St Peter's Basilica, Vatican State, Italy
A close up of the bottom left corner of the picture above. Close inspection of the full picture reveals the individual tesserae.

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