## eightThe second smallest cube number (after 13): 8 = 23 = 2 × 2 × 2. A queen or king in chess can move in eight different directions, in the same way that a compass has eight principal points: north, northeast, east, southeast, south, southwest, west, and northwest. In three dimensions, there are eight diagonal ways to move, corresponding to the eight octants into which
three-dimensional space is divided by three mutually-perpendicular planes.
Add a fourth dimension and movement
becomes possible back and forth along four directions at right angles to
each other: up and down, left and right, forward and back, and one other!
The Spanish dollar was a gold coin with a value of eight reale, and was
sometimes actually cut into eight wedge-shaped pieces – "pieces of
eight" – to make change. ## Related category• NOTABLE NUMBERS | |||||

Home • About • Copyright © The Worlds of David Darling • Encyclopedia of Alternative Energy • Contact |