Shen ring

A ram-headed bird representing the ba of Ra with shen rings in its grasp. (Louvre Museum)

In ancient Egypt, a shen ring was a circle with a line tangent to it, represented in hieroglyphs as a stylised loop of a rope. The word shen itself means "encircling" in ancient Egyptian, while the shen ring itself represents eternal protection.

In Gardiner's sign list, it is sign V9.

V9
shen
šn
in hieroglyphs
Gardiner: V9