the.com/insignia

The badge that tells you who to salute before you've read a word.

means The official emblems or symbols that mark a person's rank, office, or membership in an organization.

from From Latin insignia, the plural of insigne, meaning 'a mark' or 'a distinguishing sign' — built from in- ('into' or 'upon') plus signum ('sign' or 'mark'), the same root that gives us 'signal' and 'signature'. Latin insigne originally referred to any mark that set something apart, including decorations on shields or robes worn by officials. English borrowed the plural form wholesale in the 17th century, and though many English speakers now treat 'insignia' as singular, it was never meant to stand alone — it's a cousin of 'sign,' built to be worn as a cluster of marks announcing status at a glance.

grammar trap
technically plural; 'an insigne' is the singular nobody uses
military use
rank insignia predate written uniforms regulations by centuries
heraldry link
grew out of medieval coats of arms worn into battle
everyday version
your car's hood logo is technically an insignia too
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