square.
A Tennikoit ring has a circular shape and it is made of rubber.
Ringworm forms a ring shape on the skin because the fungus grows outward in a circular pattern, causing the center to heal while the edges continue to spread, creating the characteristic ring shape.
benzene ring
torus
a bagel
A lathe ring mandrel is a tool used in jewelry making to shape and size rings. It is placed on a lathe machine, and the jeweler can use it to hold and shape the ring while working on it. The mandrel helps ensure that the ring is the correct size and shape for the wearer.
'O' refers not to the shape of the ring but to the ring's cross-section.
A small island in a horseshoe shape is an atoll.
A torus is a pool ring shaped shape. It is made by revolving circles.
square.
A ring will change shape after a while to adjust to the shape of your finger- don't worry about correcting it! have you ever looked at your finger? It isn't perfectly round! When a ring changes shape it will undoubtedly get more comfortable!
well thats your problem you bought the wrong mood ring