I don't know if this is a complete list, but here's what I know:
%%c = Ø (circle dimension, or diameter. Also Greek letter Phi)
%%d = ° (degree)
%%o = overscore, or "overline" (opposite of underline)
%%p = tolerance (plus/minus) symbol
%%u = underlines what comes next.
%%% = percent symbol
Also, you can draw many Unicode symbols this way:
\U+HHHH, where HHHH is the Unicode symbol number in hexadecimal
\U+00B0 = degree
Steve M - firstname.lastname@example.org (remove dirt for reply)
"I do not know what I may appear to the world, but to myself I seem to
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