What makes up the category called "Marks" in NSCharacterSet?

Question

I am reading up on NSCharacterSet. Can anyone tell me (with an example if possible) what characters are in the category "Marks"?

Answer 1

The docs have a short description:

nonBaseCharacterSet

Returns a character set containing the characters in the category of Marks.

+ (id)nonBaseCharacterSet
Return Value
A character set containing the characters in the category of Marks.

Discussion
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.