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A rectangle split into two halves, each carrying nought to six pips.
Also known as: Bones, Rectangle with dots at both ends, Domino pips
Each tile shows an unordered pair of numbers. A double-six set is every pair that can be made from nought to six without repetition — twenty-eight tiles, which is why a set is that size rather than forty-nine.
A rectangular tile divided across the middle by a line, each half carrying from zero to six pips, representing an unordered pair of values.
A standard double-six set holds twenty-eight tiles: every unordered pair from nought to six, counted once. Larger sets extend the range rather than the rule, so double-nine gives fifty-five and double-twelve ninety-one.
A blank half is a value, not an absence. It is the zero, and in most games it matches only another blank.
Readers new to the game frequently take a blank end for a spoiled tile.
A rectangle twice as long as it is wide, divided by a line across the middle, with round dots arranged in each half.
Dominoes carry the same pip arrangements on half-tiles.