/pb means “PREVIOUS BREAD”
as in, it was discussed
And the number next to the pb refers to the specific item
Post 101 above
Is the past bread Q referenced
Think of it Like if we said post 119 on a previous thread
They say /pb if their link to a post or picture sends you to a previous bread, or thread, which you will have to load to read, and then you’ll have to go back to where you were if you want to pick up from where you left. It is apparently annoying to go to an old thread from the current one and then have to get back, so as a courtesy, they let you know.
thanks..