This “Standard-RG” code is based on the use of a prefix in the name of the Revit family that refers directly to the Revit category of that family.
(In-Place Families and Loadable Families)
Prefix: GMa (Metric Generic Model Adaptive family) Family name: TrianglePlan
Prefix: WA (Wall family) Family name: Generic_200mm
(Symbols, Tags and Legend)
e.g.: GN.s_North Symbol
Prefix: GN.s (Generic Annotations) Family name: North Symbol PDF Document: FAMILY NAME Free Download