Play word 単于都護府 単于都護府 ぜんうとごふ Protectorate General of the Central Asian Nomadic Lands (Chinese office established in Inner Mongolia in 650 CE)
Play word 単鉤法 単鉤法 たんこうほう in calligraphy, a style of holding the brush between the thumb and index finger
Play word 裸単騎 裸単騎 はだかたんき waiting for one tile to finish one's pair and one's hand while the rest of one's hand is exposed