Tic-tac-toe is a classic game that has been around for centuries. The game is played on a 3x3 grid, with each player taking turns to place either an X or an O in the grid. The symbols used to represent the players' moves are hyphons, exes, xes, and xs and os. Hyphons are seven letter symbols, exes are four letter symbols, xes are three letter symbols, and xs and os are seven letter symbols. All of these symbols are used to represent the players' moves in tic-tac-toe.