This icon is made up of a circle with two smaller black dots inside and is meant to represent a human head. There are two rectangles crossed below the black dots meant to represent tape that might be used to cover someone's mouth so they can't speak.
This is a Silent 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 13,300 icons, all in the same style and quality.