• (RP) IPA: /ˈɒktəʊθɔːp/
  • (America) IPA: /ˈɑːktoʊθɔːɹp/

octothorpe (plural octothorpes)

  1. (chiefly, US, typography) The hash or square symbol (#), used mainly in telephony and computing.
    • 1973, U.S patent application ser. no. 05/422,816 (filed Dec. 3 1973), issued as patent no. 3,920,926 ↗ (Nov. 18, 1975), Telephone Data Set Including Visual Display Means, col. 3 (first published use of the word)
      ...the octothorp (#) key generates a command to send the contents of the memory unto the telephone line through a send circuit...
    • 1982, Willard R. Espy, A Children's Almanac of Words at Play, Clarkson N. Potter, Inc., page 230
      Octothorp is the # on a push-button telephone. Rumor at the telephone company is that a man named Charles B. Octothorp, wanting to make his name famous...

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