Continuing the discussion from VHS Homework Assignment #1 - Your first visit to VHS:
TVP = Textured vegetable protein ?
It’s a Dutch term for Terug Vindt Post (Find Back Post); commonly used
on Dutch forums as a breadcrumb to either find something back or flag it
for later use. I guess FBP would be a better marker here 
Yay another acronym to add to the collection. FWIW, & AFAIK YMMV, the bookmark and star features work well for that but IFF you are on the web version and not email client.