Bam
The bamboo suit, numbered one through nine.
Charleston
A structured exchange of tiles near the beginning of an American Mahjong game.
Crak
The character suit, numbered one through nine.
Dot
The circle suit, numbered one through nine.
Exposure
A completed grouping placed face up after calling a discard.
Joker
A flexible tile used in eligible groupings according to American Mahjong rules.
Mahjong
The declaration made when a player completes a valid hand.
Rack and pusher
The rack holds a player’s tiles; the pusher helps move a wall into position.
Wall
A row of stacked face-down tiles built by each player before the deal.