What's this component and why does it have an RF rating?

Thread Starter

Alice24

Joined Apr 22, 2011
43
Hi guys,
I found this component while rearranging a lab (image attached)

I believe it to be a resistor, but why does it have RF rating (40 RF)? I think it seems to be rated for wattage as well, but I'm not sure-- is that what the UB-5C indicate?
 

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