"Closest Connection" status or badge: how does it work?

This is not a problem but rather a curiosity. A few weeks ago I noticed that (using a computer) if you hover over a team chat/contact picture, and select View More, there are some contacts that have a "closest connection" classification, followed by a golden/silver, bronze crown 👑 emoji. 

I identified "My closest connection" with the golden crown, "2nd closest connection" with the silver and "3rd closest connection" with the bronze one. 

Has anybody noticed this, and knows how does this classification works? What Zoom takes into consideration to classify those contacts?