coronet

n. small crown; crown-like ornament worn on the head

A coronet is a small crown consisting of ornaments fixed on a metal ring. Unlike a crown, a coronet never has arches.The word stems from the Old French coronete, a diminutive of co(u)ronne 'crown', itself from the Latin corona (also wreath).Traditionally such headgear is – as indicated by the German equivalent Adelskrone (literally: crown of nobility) – worn by  nobles, and by princes and princesses, rather than by monarchs, for whom the word crown is customarily reserved in formal English, while many languages have no such terminological distinction. Other than a crown a coronet shows the rank of the respective noble. Hence, in German language there is also the term Rangkrone. For equivalents, both physical and emblematic, in other languages and cultures, see under crown (headgear).
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Noun
1. a small crown; usually indicates a high rank but below that of sovereign
(hypernym) crown, diadem
2. margin between the skin of the pastern and the horn of the hoof
(hypernym) animal tissue
(part-holonym) pastern, fetter bone

(n.)
The upper part of a horse's hoof, where the horn terminates in skin.
  

(n.)
The iron head of a tilting spear; a coronel.
  

(n.)
An ornamental or honorary headdress, having the shape and character of a crown; particularly, a crown worn as the mark of high rank lower than sovereignty. The word is used by Shakespeare to denote also a kingly crown.
  

The circlets worn by the members of the Royal family other than the king , and by members of the nobility , especially after the middle of the 15th century.
Within the SCA , coronets have a particular meaning. Dukes can wear coronets that feature strawberry leaves. Counts , earls and the equivalents, each of whom has emerged victorious from Crown Tournament one time, have embattled coronets. Viscounts , who have attained the victory in a Coronet list , are entitled to a pointed coronet. Court barons have coronets with pearls. The standards for coronets vary from kingdom to kingdom in the SCA, as they did in Europe for the period.