⊚

Description
Circled ring.

Symbol

 * 1)  calcium ("lime", Daltonian symbol)
 * Technically, this should be red: ⊚ . May also be typeset ⦾| ⦾ or ◎| ◎, depending on which character matches the size of the other elements.
 * Technically, this should be red: ⊚ . May also be typeset ⦾| ⦾ or ◎| ◎, depending on which character matches the size of the other elements.