This icon represents an escape mask. It is a straight line across leading down to a point with a circle in the middle and rounding back around to the top. In the middle is a small rectangle that has an arched rounded bottom.
This Escape Mask 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 5,700 icons, all in the same style and quality.