A ceremonial headdress or crown, particularly one depicted on heraldic shields or worn by royalty in medieval times.
From Old French 'abacot' or possibly from Catalan origins. The word may be connected to 'abacus' through symbolic geometry, as the headdress often had structured, grid-like patterns. It appears primarily in heraldic and medieval European contexts.
The abacot appears in detailed medieval illustrations as this elaborate geometric crown-like hat that tells you something about a person's rank—knights and nobles had specific headdress designs that were as important as name tags are today.
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