broken line

noun
  1. a discontinuous line or series of line segments, as a series of dashes, or a figure made up of line segments meeting at oblique angles.
  2. a highway marking consisting of a series of disconnected line segments painted between lanes of a roadway, indicating that crossing from one to the other is permissible.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Historical Examples of broken line