Yakushima, Japan (屋久島), which could be referred to as Yaku Island
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Japanese Mahjong yaku, a specific combination of tiles that increases the value of the player's hand in Japanese Mahjong
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Yaku, Kagoshima, Japan (屋久町), a town on the island of Yakushima in Kagoshima Prefecture
In 1409, Higo (Tanegashima) Kiyotoki was given the islands of Yaku and Kuchinoerabu by Shimazu Motohisa, the head of the Ōshū branch of the Shimazu clan, who rivaled the Sōshū branch family.