- the Twins, a zodiacal constellation between Taurus and Cancer containing the bright stars Castor and Pollux.
- Astrology.
- the third sign of the zodiac: the mutable air sign.
- a person born under this sign, usually between May 21st and June 20th.
- a two-person U.S. spacecraft designed for orbital rendezvous and docking: used in 1965–66 in various experiments preparatory to a landing on the moon.
- a zodiacal constellation in the N hemisphere lying between Taurus and Cancer on the ecliptic and containing the stars Castor and Pollux
- classical myth another name for Castor and Pollux
- any of a series of manned US spacecraft launched between the Mercury and Apollo projects to improve orbital rendezvous and docking techniques
- astrology
- the third sign of the zodiac, symbol ♊, having a mutable air classification and ruled by the planet Mercury. The sun is in this sign between about May 21 and June 20
- a person born when the sun is in this sign
- born under or characteristic of Gemini
