This is a round button, which consists of two concentric circles, the inner circle and the outer circle show different colors. This emoticon is commonly used in the electronic examination interface, and is used in multiple-choice questions with two or more options for candidates to click.
Different platforms depict different icons. Most platforms depict two circles, one black and one white, while Google, Twitter and Messenger platforms depict two blue circles, one deep and one shallow. As for emojidex platform, it depicts a white circle with black edge and a red solid circle in the middle.
