
1) Device on a coat of arms 2) Heraldic charge
Found on
https://www.crosswordclues.com/clue/gyron

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 v.....
Found on
http://en.wikipedia.org/wiki/Gyron

triangular heraldic charge
Found on
http://phrontistery.info/g.html

• (n.) A subordinary of triangular form having one of its angles at the fess point and the opposite aide at the edge of the escutcheon. When there is only one gyron on the shield it is bounded by two lines drawn from the fess point, one horizontally to the dexter side, and one to the dexter chief corner.
Found on
http://thinkexist.com/dictionary/meaning/gyron/
Gy'ron (jī'rŏn)
noun [ French
giron ; of German origin. See
Gore a piece of cloth.]
(Her.) A subordinary of triangular form having one of its angles at the fess point and the opposite side at the edge of the escutcheon. When there is only one gyron on the shield it is b...
Found on
http://www.encyclo.co.uk/webster/G/72

In heraldry, a gyron is a subordinary of triangular form having one of its angles at the fesse point and the opposite side at the edge of the escutcheon. When there is only one gyron on the shield it is bounded by two lines drawn from the fesse point, one horizontally to the dexter side, and one to the dexter chief corner.
Found on
http://www.probertencyclopaedia.com/browse/UG.HTM

a subordinary having the form of a triangle, usually equal to half a quarter of the escutcheon, with its apex at the fess point.
Found on
https://www.infoplease.com/dictionary/gyron
No exact match found.