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Yes, it is written various ways. "3-hop rule", or "chain rule", or "2 hops from the target", or as the article I posted above says "two circles radiating from their named target".

I like that "two circles radiating from the named target" (or similar descriptions) because it makes clear the magnitude of the intrusion. It is everyone within 2 lines of communication with the target. If I am the target, they can get 1000+ business associates, and from there how many 1000s of associates to each of them have contact with? Someone with a statistics knowledge might be able to figure out what this means to the average person - but it's got to be many millions of possible people spied on just from getting a warrant against a single person, especially if you can go back in time, as AG Barr said in his recent interview, months or years.