I can’t think of anything that it could mean. I already know that “wt.” stands for weight.
I also noticed that it said “pg.” under the title of the feats section.
I presume you refer to the character that can be found on pages 318 & 319 of the D&D v3.5 “Player’s Handbook.” (There are a *lot* of character sheets out there these days.)
That would indeed be a reference to what page a feat is on within the book. (You’ll also find the “pg.” notation on the Special Abilities section of the sheet.)
For those using just the three core books, a simple page reference works just fine, as it is understood to refer to pages in the “Player’s Handbook.” When you start including other books (and there are a *LOT* of them, without ging beyond Wizards of the Coast (WotC) products), it gets slightly more complex.
On other character sheets, you’ll often see something like “Source Book” and “Page” references (or Ref. Pg.). One would use those places on the sheet to indicate book and page. (CAdv 42 would refer to page 42 of “Complete Adventurer, for example.)
Notations for book and page are very useful in groups using any large number of sourcebooks in their games. Using just Feats, for example, means that in the WotC books *alone* there are (as I type this) some 3,259 feats scattered across some 124 sourcebooks.
Page? That’s the normal abbreviation anyhow. I’ve never used the ‘official’ 3.5 sheet, I prefer a number of player created sheets that I’ve found online.
It’s probably intended as a place to mark down the book and page number for whatever item (particularly alchemical or magic items) or feat you’re using so you can look it up quickly during play, not a bad idea at all, given the number of books the average group tends to play with these days. 🙂
D&d 3.5 Character Sheet