At first sight of these two Chinese characters, everyone knows what it is, but perhaps not many people can pronounce it correctly. Dice, pronounced as 'tou zi'. It is a gaming or gambling tool, made of bones, wood, etc., in the form of a cubic small block with six faces marked with one, two, three, four, five and six dots respectively. In some places, it is called 'color (shai) cube'. It is an essential for mahjong game and now is also commonly seen in bars, KTVs as a miniature leisure game.