I wouldn't mind "map" (except that's overloaded) or "mapping", and Python calls them (or at least used to call them) "dictionaries", which also makes sense (except you tend to think of a dictionary as being sorted alphabetically).
Jeff japhy Pinyan,
P.L., P.M., P.O.D, X.S.:
Perl,
regex,
and perlhacker How can we ever be the sold short or the cheated, we who for every service have long ago been overpaid? ~~ Meister Eckhart