The story
Derived from the use of the letters X and O as common stand-ins for other concepts.
Etymology from Wiktionary, CC BY-SA 4.0.
X's and O's
Today it means: tic-tac-toe Full definition →
Today it means: tic-tac-toe Full definition →
Derived from the use of the letters X and O as common stand-ins for other concepts.
Etymology from Wiktionary, CC BY-SA 4.0.