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space mark

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noun Printing.
  1. a proofreader's symbol used to indicate the need to insert space, as between two typed or printed words that have been run together. Symbol: #
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Compare hash mark, number sign, pound sign.

Origin of space mark

First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018