A bit off-topic I guess but for your info, if you hold the "ALT" key and then push "0 1 8 6" it will give you the º sign.
No it doesn't. It should have been Ctrl-Shift 00B0 as per ISO14755. Unfortunately PPRuNe overloads the Ctrl-B to insert a "bold" tag so this doesn't work. (Linux+Firefox on a laptop.)
There is a character composer so that I can cut&paste the right characters in but I couldn't be bothered.