Definition
Mah Jongg is the National Mah Jongg League's spelling of mahjong, and in the United States it usually signals the American game played with the League's yearly card.
Every spelling refers to the same family of tile games. The two-word form with two g's is the American league's, and single-word mahjong is the general and international spelling.
At the table
The spelling tells you which game someone means. Two words with two g's is the National Mah Jongg League's house style and usually signals the American game with jokers and a yearly card, while single-word mahjong is the general and international spelling. Neither is wrong, and if you are searching for rules it is worth trying both.
Also called mahjong, mah-jong, mahjongg.
Read the full guide: Mahjong, Mah Jongg, or Mah-Jongg? The Spelling, Settled.
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