Unicode characters (0xF700–0xF8FF) that are reserved for function keys on the keyboard.
- macOS 10.0+
NSString objects, these constants represent values that can be used with the
characters properties and may be used in some parameters in the NSEvent method
Note that some function keys are handled at a lower level and are never seen by your app. They include the Volume Up key, Volume Down key, Volume Mute key, Eject key, and Function key found on many computers.