This is the Czwartek 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.
Thursday is represented by the first two letters of the word Thursday, Th, which are centered in a square that resembles a page from a day calendar, with two squares on top to look like hangars for the calendar.