The primary symbol for Cancer is the Crab. This creature perfectly embodies the Cancerian nature: a hard, protective outer shell shielding a soft, sensitive interior. Crabs move sideways, reflecting the indirect, intuitive approach Cancers often take in life. They are also connected to the shore, the space between land and sea, symbolizing Cancer's emotional depth and connection to home and family.

Cancer is one of the three Water signs, alongside Scorpio and Pisces. This element represents emotion, intuition, and the subconscious. Like water, Cancers are fluid, deeply feeling, and possess an undercurrent of strength. They are highly receptive to the moods of others, often absorbing emotional energy from their environment. Their emotional world is vast and profound, guiding their decisions and connections.

The astrological glyph for Cancer ♋ is commonly interpreted as two swirling circles or a pair of claws. This symbol represents the protective nature of the Crab, as well as the feminine principle, receptivity, and the cyclical nature of life. The glyph also resembles the number 69, symbolizing the constant flux between giving and receiving, and the union of opposites within the self.

In astrology, Cancer rules the Fourth House, the sector of the sky associated with home, family, roots, privacy, and the foundation of the self. This rulership emphasizes Cancer's intrinsic need for security, a safe emotional harbor, and deep connection to ancestry. It's the sign of the nurturer, the one who creates a sanctuary and holds the memory of tradition.