One of the yakuman (highest-scoring) hands in mahjong. Known in English as "Four Concealed Triplets". Comes in two variants: suuankou-tanki where the four triplets are in the hand and the last wait is on a single tile to complete the pair, and suuanoku-shanpon where three of the triplets are in the hand and the wait is on a tile to complete either of the two remaining pairs.