I think if ‘by’ was really important it would have been NOSTBR 😂😅
Discussion
Your call!
relays are not transmitted. it's not necessary with an abbreviation, like USA
If it said,
United
States
America
people would naturallly wonder where the 'of' is
It makes no sense when you formally write it out without the 'and' and 'by'
"Nostr stands for “Notes and Other Stuff Transmitted by Relays”
up to you.
I concur