Noun
Windows key (plural Windows keys)
(computing) A key on a computer keyboard bearing the Microsoft Windows logo, used to open the Start menu and as a modifier key for various other functions.
Once you’ve found your Windows key, make sure it’s kept in a place where you can find it again! Source: Internet
The manual makes a couple of references to Windows and in fact the keyboard does also work with Windows, but there is nothing silly like a Windows key and this really is designed for the iPad. Source: Internet