Sekcja and other 85,000 icons from Icons8 icon pack follow the visual guidelines of the operating systems: Windows, iOS, Android KitKat, and Material. PNG format is free up to 100x100 px. Icons are availble for download in PNG and vector (SVG, PDF, EPS, and more).
The icon is shape like two horizontal S shapes. However they are not separate, instead they over lap a bit. The bottom of the top S connects to the middle of the bottom one and the top of the bottom S connects with the middle of the top one.