This is the Nagłówek 3 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.
The icon comprises of a pair of empty block letters, a capital H and a 3. The icon represents the third level of header within an HTML document, below two layers of header, H2 and H1. This header level is typically used to represent sub-sub-sections of a document.