Pisces is a sun sign on the astrological calendar. To be a Pisces is to be born between February 19th through March 20th. Generally speaking, Pisces are most compatible with Cancer, Taurus, Capricorn and Aquarius. Pisces is a sensitive and artistic sign. They are generally sensitive and have a kind heart, but can be vague and wishy-washy. Pisces generally have good hearts.