In ancient Egypt, the "sa" symbol was a hieroglyph that represented protection, particularly magical or divine protection. It was shaped like a life preserver or a knot and was often depicted in amulets, jewelry, and carvings. The "sa" amulet was believed to provide safety and ensure well-being for both the living and the dead.

The symbol was closely associated with deities like Taweret, the goddess of childbirth and fertility, and Bes, a protective god who guarded households. Both deities were seen as protectors, particularly of women and children. It was common to see the "sa" symbol in funerary art, alongside other protective symbols like the ankh (life) and the djed pillar (stability).