This Sieć komórkowa 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 icon is for cellular network service. In the center, it has a straight vertical line with a small circle on the top of it, indicating an antenna. There's one small, unclosed circle around the top of it, then a larger circle around that one.