It's a logo to describe fog. It's a line drawing of a round sun with 6 lines protruding from it as sun rays with 3 horizontal lines extending from as fog.
This Haze 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.