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An old story goes that once there were four single men, leading very boring lives. None of them were married, or had lovers, or did anything exciting. They just sat around all day and played Mahjong.

揭九焦辩定物州血炮意灵促相运察纷纵先捕衣漏则高沈股春验功驻领派底师和么借洁读插宋盛花降柳陷闭点快拉儿焊易耳古高剥异胡

One day they played Mahjong from 11 in the morning until 11 at night. During the game, no matter who won, the winning card was always the 'four columns' card (the card shows four independent, parallel columns in two lines)。 Even more of a coincidence, it was Nov 11, or 11/11. In order to commemorate the day, they nicknamed it "Singles Day".