Answer: xox

AnswerCrossword Clue
XOXTic-tac-toe loser
XOXTic-tac-toe line
XOXLosing line in tic-tac-toe
XOXPencil game loser
XOXNoughts-and-crosses line
XOXAffectionate sign-off
XOXCertain losing line
XOXLosing row
XOXWorthless tic-tac-toe row
XOXLosing tic-tac-toe line