A backgammon set.
backgammon definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a game played on a special board by two people: each has fifteen pieces, which are moved according to the throw of dice
Origin: back plush gammon
backgammon definition by American Heritage Dictionary
A board game for two persons, played with pieces whose moves are determined by throws of dice.
Origin: back1 + gammon1.