• (ten pin bowling) The pin at the centre of the triangle of bowling pins (originally the tallest pin in kayles). Sometimes also the headpin at the apex.
  • (motorized vehicles) The axis around which steered wheels pivot; a bolt that holds the axis in placeā€”a kingbolt.
  • The bolt holding together the truck of a roller skate or skateboard.
  • The most important person in an undertaking or organization.

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