X, x x x x X X chi x x X chi chi X chi

noun, plural X’s or Xs, x’s or xs.

1. the 24th letter of the English alphabet, a consonant.
2. any spoken sound or combination of sounds represented by the letter X or x, as in xylene, box, or exact.
3. something having the shape of an X.
4. a written or printed representation of the letter X or x.
5. a device, as a printer’s type, for reproducing the letter X or x.