Bulletin Board Service. What forums were called in the early days of the internet, IIRC.
Way back before The .net one had to dial up on a phone line Modem directly to the Server for whatever place you wanted to connect to.
For example the NRA BBS was called Gun Talk. The phone number was: (703)Gun-Talk (703)486-8255. I had at the time a ...hold on...2400 Baud Modem.
I spent many $$$ calling there. That’s the place I found out what REALLY HAPPENED at Ruby Ridge,ID when the feds Murdered Vicki Weaver as She held The Baby standing in Her front door UNARMED. That was after they Murdered Sammy Weaver. And the Weavers Dog Striker. Most of the story is on Wiki.