also: ファン
counter
han; fan; mahjong scoring unit
In mahjong, a counter that determines the base points of a hand; each han doubles the score (or adds a multiplier).
この手は三翻ある。
This hand has three han.
役満は十三翻以上で計算されることもある。
A yakuman is sometimes calculated as 13 han or more.
From Chinese 翻 (fān), meaning 'to turn over' or 'to double', adopted into Japanese mahjong terminology as a scoring unit.