ref() returns "REF" for a reference to a reference:
> perl -e 'print ref \\"test"'
REF
In general, it's not smart to rely on any specific value for ref() beside true or false, except when you really have to, i.e. for serialization. The value of ref() has changed for some types (regexes (?), filehandles...), and AFAIK there is no guarantee it won't change again.
edit: after reading perlfunc on it, it appears you can count on the return values given there (which do not cover all perl data types):
SCALAR
ARRAY
HASH
CODE
REF
GLOB
LVALUE
and the package name for a blessed object (though you shouldn't use that)
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