The Water element represents the feelings, receptivity, passivity. It corresponds to the feminine side of things, it is vulnerable, unstable and subjective.
In the Tarot, the suit of Cups corresponds to the element of Water.
In astrology, the signs that correspond to the element Water are Cancer, Scorpio and Pisces.
At Element we can add to the quality:
Cardinal: astrology signs are taking the initiative on things. Cancer corresponds to the element of Water and is cardinal type.
Fixed: it corresponds to the signs that adopte a stubborn attitude and resists to change. Scorpio corresponds to the element of Water and is fixed rate.
Mutable: is the property of the signs that are more flexible and adaptable to different situations. Pisces is an Water sign type mutable.