Scorpio the Scorpion October 23 - November 21 Scorpio (♏) is 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. Traditionally, the planet Mars has been considered to be the ruler of Scorpio. But since its discovery in modern times, Pluto has been considered the primary ruler, with Mars as co-ruler. 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.