multi-sided wait; complex wait
In mahjong, a hand that is waiting for three or more different tile types to complete. A technical term used in strategy discussions.
If you build a multi-sided wait shape, your chances of winning increase.
This hand is waiting on three or more sides, so it can be called a multi-sided wait.
Compound of 多面 (tamen, 'many sides') and 待ち (machi, 'wait'), a mahjong term describing a hand waiting for multiple tile types.