Also known as aircraft insignia
thumb|right|The Flag of France|Tricolore cockade of the [[French Air Force was first used on military aircraft before the First World War]]
thumb|right|The Flag of France|Tricolore cockade of the [[French Air Force was first used on military aircraft before the First World War]]
A roundel is a circular disc used as a symbol. The term is used in heraldry, but also for a type of national insignia used on military aircraft, generally circular and usually comprising concentric rings of different colours. Roundels are used in many other contexts as well.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).