The term DOT ON A DOMINO can be summarized as a PIP, which is a three-letter word. A dot on a domino is a small, round mark that is placed on the surface of a domino tile. It is used to represent the value of the tile in a game of dominoes. The number of dots on a domino tile can range from one to six, and each dot represents a different numerical value. In a game of dominoes, players use the dots on the tiles to create a line of tiles with matching values.