(Hinduism) Yama, the Hindu god of death / (Buddhism) Short for 夜摩天 (Yamaten): Yama, the Buddhist ruler of 奈落 (Naraku, “Naraka, hell”)

late at night

a night owl (idiomatic)

(euphemistic) job in the nightlife / sex industry

(Internet slang, humorous, pun) Christmas Eve, as a night of sexual activity between young couples

(collective, literally) a thousand nights / (archaic, figuratively, collective) lots of nights; an innumerable number of nights

a female given name

a motif in Chinese art featuring the "three friends of winter": pine (or daffodil), bamboo, and plum blossom

(offensive, Internet slang) Alternative form of 子供部屋おじさん

(offensive, Internet slang) a man whose age is greater than about thirty or forty who lives in one's child room and with one's parent(s).