Toroid (トーロイド?) is an enemy first appearing in Xevious. An enemy shaped like the coin that appears early in the game. It is easily destroyed with your zapper. Later on, it gains the ability to shoot. Unlike the others, they are the least dangerous enemies in the game.
In Xevious Resurrection, there is a boss that resembles a gigantic Toroid with 4 red sectors and an inner ring with 3 red sectors.