The eighth astrological sign in the Zodiac, originating from the constellation of Scorpius. Scorpio is considered a feminine, negative (introverted) sign by most modern astrologists. It is also considered a water sign and one of the four fixed signs. The planet Mars is the ruler of Scorpio. As the eighth sign in the zodiac, Scorpio is associated with the astrological eighth house. The lower arrow pointing up in the Scorpio symbol represents the venomous tail of the Scorpion or claw of wolf.