The planetary ruler of Gemini, Mercury is all about communication, mind and intellect. It is also about duality and mystery.
Mercury is about information, media and travel. Particularly short distances.
It is also about opinions, ideas and mind matters. Mercury governs speech and writing abilities.
In mythology, Mercury or Hermes was the messenger of the gods.
It takes Mercury 88 days to travel through all the signs of the Zodiac, and spends about seven days in each sign.