Per prior emails, added \asciicirc entity in org-entities.el, to expand to ascii "^" character, or \textasciicirc in LaTeX.  Also fixed bug a few lines earlier, wherein \circ (org entity) would expand to \circ (latex entity) in LaTeX export, even though the former indicates a circumflex accent and the latter a small *circle*.  (The expansion to ˆ (html entity) is correct.)

~mark