Schematic components
I'm not familiar with Proteus so I don't know exactly what it would be called or where it would be found, but for the 50Hz 'component' it looks like it may represent a solder bridge. I don't recognize the 60Hz component, but if I had to guess I'd say that it represents somewhere where you would cut the trace. This would allow you to configure the system for 50Hz or 60Hz operation. It may not be the type of component that would be in a default schematic library, you may need to create it yourself, assuming Proteus has the tools to do so.