Ⓣ

Symbol

 * 1)  temperature control switch
 * 2)  unidentifiable/indeterminate tonicity (stress or tone)
 * 3)  tin (Daltonian symbol)
 * 1)  temperature control switch
 * 2)  unidentifiable/indeterminate tonicity (stress or tone)
 * 3)  tin (Daltonian symbol)

Related terms
See for uses of a letter inside a circle.
 * 🅣