The only common ones are $db and $vbulletin ($vbulletin->forumcache, $vbulletin->bf_... and many more), use var_dump() on variables to see their contents then you have to figure out what each variable is for. The only way to learn is with experience and trial and error.
The variables are only created when they are needed, you might find $forumid in one file and not another so if someone created a list it would be pages long...
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