gameplay general
Pon
ポン
Definition
Calling another player's discard to complete a triplet. Can be called from any player out of turn. Opens your hand.
Related Terms
Chi
チー
Calling the previous player's discard to complete a sequence. Can only be called from the player to your left (kamisha). Opens your hand.
Kan
槓
A quad - four identical tiles. Can be concealed (ankan), open (daiminkan), or added to an existing pon (shouminkan). Reveals an additional dora indicator.
Triplet
刻子
Three identical tiles. Can be concealed (ankou) or open (minkou). Also called koutsu.