! Help with symbols using the "ALT-numberkeys"

I don't think that its considered ascii, but I figured that SOMEONE
may know what the hell I'm talking about.   :-)


I'm looking for a website or list of all of the different combinations
and the outcome for when you hold down the ALT key, hit a series of
numbers and then release it to give you different kinds of symbols
like:   � � � � 

The ones I did above are just random things I did to show what I'm
talking about.   The main ones I need (if they even exsist) are:
"diameter symbol" (a circle with a slash through it)
"degrees symbol"  (small circle at the top right)
"plus or minus symbol"  ( +/-  all in one character)



Any help you can give me with a list, website URL or even just those
ones I need most would be greatly appreciated.

Shawn

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