They are called Tesserae
The small tile parts of a mosaic is called tesserae
The small tile parts of a mosaic is called tesserae
The small tile parts of a mosaic is called tesserae
The small tile parts of a mosaic is called tesserae
The small tile parts of a mosaic is called tesserae
The individual tiles are usually called tessera.
Small pieces of colored glass are called "mosaic tiles."
If you are referring to the art in general, as in the type of art famous for depicting Bible scenes in cathedrals and church sanctuaries, it is simply called stained glass, or Mosaic, art.
Mosaic I think
An image made of small colored tiles in a pattern is called a mosaic. Mosaics are created by arranging multiple small pieces of material, such as glass, stone, or tile, to form a larger image or design.
mosaic
It is called a mosaic no matter the topic.