Hex"a*gram (?), n. [ Hexa- + -
gram.]
A figure of six lines; specif.:
(a)
A figure composed of two equal triangles
intersecting so that each side of one triangle is parallel to a side
of the other, and the six points coincide with those of a
hexagon.
(b)
In Chinese literature, one of
the sixty-four figures formed of six parallel lines (continuous or
broken), forming the basis of the Yih King, or "Book of
Changes." S. W. Williams.
© Webster 1913.