This is a drawing of a rain cloud that is flat on the bottom with three curvy lines coming up the sides and on the top. There are three dashed lines coming out the bottom of the cloud. There are two little dashes in each line.
This Rain 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.