This Thursday icon is a responsive icon. This means that it's optimized for four resolutions, from tiny 16x16 until highly detailed 80x80. The style comes from the latest Microsoft Office, which makes it perfect for any Windows applications, in particular, those with ribbon toolbar control. Unlike other icon packs that have merely hundreds of icons, this monster icon pack contains 15,500 icons, all in the same style and quality.
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.