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jim dash

[jim]
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noun Printing, Journalism.
  1. a dash, often three ems long, used within a headline, between the headline and the main body of printed matter, between items in a single column, or between related but different material within a story.

Origin of jim dash

jim, probably special use of Jim proper name
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018