back·gam·mon
noun/ˈbækɡæmən/
/ˈbækɡæmən/
[uncountable]- a game for two people played on a board marked with long thin triangles. Players throw dice and move pieces around the board.
enlarge image十五子棋戏（棋盘上有楔形小区，两人玩，掷骰子决定走棋步数） Word Originmid 17th cent.: from back + gammon, mid 18th cent.: apparently from Old English gamen or gamenian (see game), with survival of the -n ending.