This Rękaw - wskaźnik wiatru 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 4,300 icons, all in the same style and quality.
This looks like a vertical line with a small circle at the top of it. There is a wavy rectangle to the right of the small circle. The rectangle is split into 5 sections. 3 of the 5 sections are dotted.