Limpet shell

The Common limpet persistence, steadfastness, and anchored strength.

Sometimes a symbol becomes important not because it has a universal meaning, but because it resonates with something your mind or spirit is already trying to bring into awareness.
IThroughout history (especially in places like Scotland and Ireland), limpets provided crucial nourishment during times of starvation and famine. Spiritually, this associates the shell with survival, humility, and being sustained by nature even in destitution.