# union bug

> English word · Noun

## Definitions
1. 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.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/union-bug