Definition
The wall is the four rows of face-down tiles, nineteen long and two high per player, that all draws come from during a hand.
East breaks the wall with a dice roll, and the hand ends as a wall game if the wall runs out before anyone wins.
Read the full guide: How to Set Up an American Mahjong Game: Wall, Deal, and Seats.
See it on real tiles: the coach reads any hand and names its direction, free, at the free read. Members get the coach on call for their own games.
More terms: Pung, Kong, Quint, Pair, Charleston, Blind pass, Courtesy pass, Joker.