I'm familiar with all the standard Cisco shapes to depict various types of switches and routers. I've also come up with a pretty good shape to show encryption devices. I'm having a hard time trying to come up with something that would show a media converter (Ethernet to fiber and vice versa) on my network drawings using Visio. Do anyone know of a standard shape that's used?
There is no true "standard" symbol/shape for a media converter, since that is generally viewed as an interface-level item. Most network diagrams tend to show entire devices instead of individual interfaces, and leave Layer 1 connections as a simple line.
If I were to come up with a symbol, I would probably avoid use of standard electronic diagram ones and instead opt for a simple labeled box or ellipse, just to avoid confusion.