This is a Beta icon. We've made it in iOS style, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 12,300 icons, all in the same style and quality.
Its an image of the Greek letter beta. It a B shape with rounded corners, that is two lines thick. The back of the B is extended slightly beneath the letter, almost like a comma hanging off the bottom.
Related to Beta Icon
Related icons are the icons with matching tags, as well as all alphabet icons. All icons are in the same flat style. You can either download free PNG icons or buy SVG vectors