First use of J that I can recall.
In dance, a "number" is a routine. A Bacon number is how many degrees an actor is away from Kevin Bacon. There is a game called "Six Degrees of Kevin Bacon". So, if an actor has been in a film with Kevin Bacon, their Bacon number is 1. If they were in a film with an actor who was in a film with Kevin Bacon, their Bacon number is 2. Years ago, we did "Six degrees of Brokeback" and tried to connect various actors with BBM actors. https://bettermost.net/forum/index.php/topic,477.0.html
Even took the bot 5 tries!