Scorpio is the eighth astrological sign in the Zodiac, originating from the constellation of Scorpius. Scorpio may refer to a Scorpion, a venomous animal, from which most of the following get their name: Scorpius, one of the constellations of the western zodiac; Scorpio (astrology), the astrological sign represented by this constellation; Technology Scorpio (dart-thrower), Roman artillery invented in 50 BC.