A cross or crossing made in opposition to another, or a mark placed to oppose or nullify another mark.
From counter- (against, opposite) + cross (intersection or mark). The prefix counter- comes from Latin contra meaning against, while cross derives from Old Norse kross. The compound emerged in Middle English to describe opposing or contradictory crossings.
This word appears in heraldry and medieval documents to describe deliberate counter-markings used to invalidate or protest official crosses—essentially the medieval version of marking through something you disagree with, which shows how humans have always found ways to visually oppose authority.
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