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 Silent icon is made in Material Design style
developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 6,200 icons, all in the same style and quality.