A gyron is a triangular heraldic ordinary formed by two lines extending from the edge of the shield to meet at the center at a 45° angle. A shield divided into eight gyrons is called gyronny. The word gyron is derived from Old French giron, meaning 'gusset'. Another term for a single gyron is esquire.
The gyron rarely appears singly, but as a variation of the field, gyronny coats appear frequently. These most often appear as eight roughly equal parts, but occasionally a coat gyronny of six, ten, twelve or more parts may be specified.
- "Gyron". Concise Oxford English Dictionary (11th ed.). Oxford: University Press. 2008. ISBN 9780199548415.
- Friar, Stephen, ed. (1987). A New Dictionary of Heraldry. London: Alphabooks/A&C Black. p. 139. ISBN 0 906670 44 6.
- Fox-Davies, Arthur Charles (1909). A Complete Guide to Heraldry. New York: Dodge Publishing Co. p. 137.