It's for the fraction bbcode. I don't have VB license so I can't access these pages. Please paste the code here or look for the bbcode that could help users posts fractions.
http://www.vbulletin.org/forum/showthread.php?t=255825http://www.vbulletin.org/forum/showthread.php?t=255875
Version 3.8 would be great.
Comments
LATEX expression bitches.