I found a helpful page showing Alt codes for Mathematical symbols

http://usefulshortcu.../maths-alt-codes.php(I've confirmed the numbers given correct at other sites)

Some of them work for me, but some dont e.g. I get the wrong symbol with Alt247.

I get a

**¸**I'm wondering is this to do with the font -- would I need a special font for some symbols?

Or could it be to do with using a qwertz (German) keyboard?

I'm specifically looking for the 'equivalent' symbols:

[Alt 247]

(Couldnt find an Alt code for this one! It seems to be not that common, or not commonly used for maths)

Copying and pasting of symbols (from wikipedia) does not work either e.g. with first example I get a

**~**Anyone got any ideas here?