Yes there is type in the 'o' then highlight it, right click go to font then there should be subscript and superscript. Have a play around to see which is which. Good Luck!!
Press the Alt key then 0176 on the numeric key pad. This will work in any application e.g. notepad. You can also use the Character Map application. This can be be found on the 'Programs.Accessories.System Tools.Character Map' menu item.