Terrible name no? It’s a nostr name. Mine is rabble@nos.social which I got from using the nos.social app. Primal also lets folks get user@primal.net names. 

But you don’t need to get your name from the folks who give you your app. 

Here’s some more information on how it works with a directory of providers to choose from. 

https://nostr.how/en/guides/get-verified 

 Thanks for the explanation! 😀