This Muszla koncertowa w parku 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 shape has a rectangle on the bottom which is split into two horizontally. The bottom is slimmer than the top. On top of it are 4 curved lines starting from the right and ending on the left of the rectangle like a rainbow.