A character set containing the characters in Unicode General Category M*.
- iOS 2.0+
- macOS 10.0+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
A character set containing all the non-base characters.
This set is also defined as all legal Unicode characters with a non-spacing priority greater than
0. Informally, this set is the set of all characters used as modifiers of base characters.