double point

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double point (plural double points)

  1. A symbol, such as a colon, composed of two points.
    • Henry Bradshaw
      As with the printers a full-point, a double point or colon, and a triple point, are each of them single types, the matter was still more simplified.
  2. (mathematics) A point on a curve at which there are two tangents (because it touches itself, or has a cusp).