This icon represents fire alarm button. It is a circle with two curved lines on the outside. The lines on the outside are significantly larger than the circle and surround it without ever touching it or each other.
This Alert 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.