This is the Muszla koncertowa w parku icon for Windows 10. Here we go. Optimized for 32x32 px, these are the simplest icons in the line style. Downloadable formats are PNG and SVG, among others. Icons8 icon pack is unique in providing a huge number of icons designed by the same team of four designers who create the new icons every working day in the same style and with the same quality. Same cool as the Bat Face, huh.
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.