RG in a Telecom/Signal/Fiber Optic (VDE 0815 - 0816 - 0888) cable code

This symbol has more than one meaning in this system; which one applies depends on where it stands in the designation. The decoder tries each.

Symbol	Meaning	Part of the cable
RG	Coaxial Cable According To Military Specification	Other
RG	Galvanized Round Steel Wires With Counter Helix Of Galv. Steel Tape	Armour (wire and tape)

Source: The 2016 symbol tables of this site

Designations that use it