(astronomy) the zodiac constellation Gemini; also refers to the third sign of the zodiac in Western astrology; same as 双子座 shuāng​zǐ​zuò

(physics) a pair of stars that orbit each other due to their mutual gravitational attraction

(abbreviation) the Twin Towers, specifically referring to the former World Trade Center in New York or similar landmark buildings; short for 双子星大楼 shuāng​zǐ​xīng​dà​lóu