naval crown
/ˌneɪvl ˈkraʊn/Roman History and Heraldry
noun
A crown or garland given, originally by the Romans, to a person who achieved victory or distinction in a sea battle. Also: a depiction of such a crown, especially as a crest or charge in heraldry.
Origin
Late Middle English; earliest use found in John Lydgate (c1370–c1449), poet and prior of Hatfield Regis. From naval + crown, after classical Latin nāvālis corōna.