This is the Kalendarz 26 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.
It's an icon of a calendar, set on the 26th day of the month. It's displayed as a square with two ring-like objects at the top, to indicate that the pages flip over. There is the number 26 in the center of the square.