Logitech K480 - Keyboard Layouts and Labels; Reserved Key Labels; Split Key Labels

A unique multi-function layout makes the Logitech Keyboard K480 compatible with the
computer or mobile device you’re currently using. Key label colors and split lines identify
functions or symbols reserved for different devices and operating systems.
Key label color
Gray labels indicate functions available on Apple® devices running Mac OS X or iOS.
White labels on gray circles identify symbols reserved for use with ALT GR on Windows