Unicode.Property.noncharacter_code_point-question-mark
You're seeing just the function
noncharacter_code_point-question-mark, go back to Unicode.Property module for more information.
Returns a boolean indicating if the
codepoint or string has the property
:noncharacter_code_point.
For string parameters, all codepoints in
the string must have the :noncharacter_code_point
property in order for the result to be true.