A small stone or pebble used as a playing piece in the children's game of dibs or jacks.
From dib (to fish by letting the bait dip gently into the water, or a game piece) + stone. The term dates to at least the 18th century and reflects the materials available for children's games.
Before plastic toys existed, children played with whatever they found—smooth pebbles became jacks, knucklebones became dice, and these humble dibstones taught math and coordination.
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