X's and O's

Etymology
Derived from the use of the letters X and O as common stand-ins for other concepts.

Noun

 * 1) tic-tac-toe
 * 2)  The fundamental elements of a play.
 * 3)  The basic delineation of roles in a project.
 * 1)  The fundamental elements of a play.
 * 2)  The basic delineation of roles in a project.
 * 1)  The basic delineation of roles in a project.
 * 1)  The basic delineation of roles in a project.

Noun

 * The college co-ed signed her letter to her mother with X's and O's.
 * The college co-ed signed her letter to her mother with X's and O's.
 * The college co-ed signed her letter to her mother with X's and O's.