1 named feature carries the IAU descriptor Facula — a bright spot on Callisto, out of 61 in the mapped Solar System.
The IAU assigns each feature class on each world a naming theme. Across the 1 faculae with a recorded origin, one category covers them all, led by Iceland.
Every one has its own page, on the surface it sits on.
The same descriptor is used on 4 other worlds, for 60 more features.