union bug (English, noun)
expansion: union bug (plural union bugs)
Senses:
topics: media
printing
publishing
glosses: A maker’s mark imprinted on a work to show that it is sanctioned by members of a trade union. It is often a tiny elongated rhomboid containing and surrounded by, in minuscule typeface, identifying names and the union’s local chapter number.
Forms:
form: union bugs
tags: plural