triple run; three color straight
A mahjong hand containing the same numerical sequence (chow) in all three suits. Often worth 2 han when the hand is closed.
Sanshoku doujun is a yaku where you form the same sequence in the man, pin, and sou suits.
If the hand is closed, sanshoku doujun is worth two han.
From 三色 (three colors/suits) + 同順 (same sequence). A standard mahjong term.