Unicode.Property.ids_trinary_operator
You're seeing just the function
ids_trinary_operator, go back to Unicode.Property module for more information.
Returns :ids_trinary_operator or nil indicating
if the codepoint or string has the property
:ids_trinary_operator.
For string parameters, all codepoints in
the string must have the :ids_trinary_operator
property in order for the result to :ids_trinary_operator.