- 三九天 sānjiǔtiān dead of winterThe coldest days of the year, referring specifically to the period from the 19th to the 27th day after the winter solstice.
- 九天揽月 jiǔtiānlǎnyuè to reach for the stars(idiom) to pluck the moon from the highest heaven; to achieve something very difficult or reach for a lofty goal
- 九天娘娘 jiǔtiānniángniang Lady of the Nine Heavensancient Chinese Taoist goddess of war, sex, and longevity, also known as the Dark Lady of the Nine Heavens
- 九天玄女 jiǔtiānxuánnǚ Xuan NüThe Mysterious Lady of the Nine Heavens; a Daoist goddess of war and longevity in Chinese mythology, said to have helped the Yellow Emperor defeat Chiyou.
- 数九天 shǔjiǔtiān the coldest time of winterThe period of eighty-one days following the winter solstice, traditionally divided into nine sets of nine days each and considered the coldest time of the year.