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Triominoes is a variant of dominoes using triangular tiles. A popular version of this game is...

Triominoes is a variant of dominoes using triangular tiles. A popular version of this game is marketed as Tri-Ominos by the Pressman Toy Corp. A triomino is in the shape of an equilateral triangle approximately 1 inch (2.5 cm) on each side and approximately 1/4" (6.35mm) thick. Each point of the triangle has a number (most often from 0-5), and each triomino has a unique combination of numbers (with repetition of a number allowed in the combination). With the 6 possible end values commonly seen, there are 56 unique combinations and thus the standard triomino set has 56 tiles. Larger sets are possible; including 6 as a possible end number would result in 84 tiles. Tiles are most often made out of a plastic or resin that approximates the feel of stone or ivory, similar to most modern commercial domino sets. Numbers are recessed into the surface and painted with black enamel. Some "deluxe" sets include a raised brass tackhead in the center which assists in mixing up or shuffling tiles, as the tackhead reduces the surface area of the tile contacting the table, so tiles move more freely. Valid play of a triomino is similar to that of a domino in that the sides contacting each other must