Trigon
Trigon , noun
[Latin trigonum, Greek {not transcribed}; {not transcribed} (see Tri-) + {not transcribed} a corner, angle: compare French trigone.]
1.
A figure having three angles; a triangle.
2.
(a) (Astrology) A division consisting of three signs.
(b)
(Astrology) Trine, an aspect of two planets distant 120 degrees from each other. — Hutton
3.
(a) (Greek & Rom. Antiquities) A kind of triangular lyre or harp.
(b)
(Greek & Rom. Antiquities) A kind of game at ball played by three persons standing at the angular points of a triangle.