If you mean as they are used in MS Word I doubt that you can, if yo
just wish to see a number in a small circle (looks like a snooker ball
change the font to Wingdings or Wingdings2 and select the require
character.
A character map is available by clicking Start, Run and type CHARMA
and press enter, you can view available characters there and copy
paste into Excel as required, remember to name the font.