Ⓖ

Symbol

 * 1)  generator
 * 2)  an unidentifiable/indeterminate glide/approximant or (rarely in English) velar consonant
 * 3)  gold (Daltonian symbol)
 * An early form had 8 ticks or triangles on the inside of the circle, and thus a smaller 'G'

Related terms

 * See for uses of a letter inside a circle.