A half-gorge or a partial ravine, typically in heraldry or architectural design.
From 'demi-' (half) + 'gorge,' which comes from Old French 'gorge' meaning throat. The term originally referred to half of a heraldic gorge design, which is itself a piece of armor protecting the throat.
Heraldry is like emoji for medieval nobles—a demigorge would've been shorthand showing only partial protective armor, instantly communicating something about rank or lineage to anyone who could read these symbols.
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