Western Astrology: Astrological Compatibility Gemini: Gemini is the third sign of the zodiac. It is ruled by Mercury. A mutable air sign gives its holders the characteristics of insight, adaptability, and versatility. Gemini is a mental rather than physical sign, making a Gemini a natural inventor. They are always interesting people to have a conversation with, and are quite technologically savvy. Their energy often comes and goes in spurts, and they can appear quite high-strung. Gemini boys and girls are often mistaken as being hyperactive. Geminis are the type of people that have to know how things work. more about Gemini Now please select your partner’s astrological sign: Gemini and Aries Gemini and Taurus Gemini and Gemini Gemini and Cancer Gemini and Leo Gemini and Virgo Gemini and Libra Gemini and Scorpio Gemini and Sagittarius Gemini and Capricorn Gemini and Aquarius Gemini and Pisces