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30-dash

American  
[thur-tee-dash] / ˈθɜr tiˌdæʃ /

noun

  1. Printing, Journalism. the symbol —30—, —XXX—, —O—, etc., often used to mark the end of a piece of copy, story, etc.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.