MB Free Zodiac Communication Sign describes your characteristics based on the placement of Mercury in your birth chart. Mercury is a planet which is considered to be the planet of Communication. This sign describes your communication abilities, thinking and learning capabilities. This sign also shows your decision making skills. MB Free Zodiac Communication Sign describes your characteristics based on the placement of Mercury in your birth chart. Along with the sun sign and moon sign, the communication sign also helps you understand yourself better. In Roman mythology Mercury was the messenger of the gods. Astrologically Mercury stands for thinking abilities, intelligence and ability to respond to others. This sign shows how you reason in different situations and describes your decision making skills. Communication need not be only in the form of talking but also includes writing, learning and all possible types of media.