ABSTRACT

O The symbol O is sometimes used to represent CAYLEY NUMBERS (also commonly known as octonions).

See also CAYLEY NUMBER

A polyhedron formed by two parallel rectangles, not congruent to each other, whose side faces are trapezoids. The VOLUME is given by

V16 h[(2aa?)b(2a?a)b?]

The distance from the bottom base to the CENTROID is

z¯ h(ab ab? a?b 3a?b?)

2(ab ab? a?b 2a?b?) :

The term obelisk is sometimes also used to refer to the DAGGER symbol (Bringhurst 1997, p. 275).