trigram

A figure composed of three solid or interrupted parallel lines, especially as used in Chinese philosophy or divination according to the I Ching.

A geometrical form consisting of three elements, like a triangle, a triskele, a heart, etc.

In geometry, three coplanar, non-copunctal straights.

Same as trigraph.

In Chinese Taoism, a symbol composed of three marks each of two types (creating 8 possible symbols) which are used for philosophical discussion and divination (fortunetelling).