30-dash

[ thur-tee-dash ]
/ ˈθɜr tiˌdæʃ /

noun

Printing, Journalism. the symbol —30—, —XXX—, —O—, etc., often used to mark the end of a piece of copy, story, etc.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019