Invokes windows' Symbol viewer for selection of special characters in any installed font. The 'viewer' is shown below.

If you find yourself entering symbols regularly, this may for example be the € symbol which is not available on a US keyboard, you can do this without invoking the menu by changing the 'from' drop-down to ASCII (decimal) and noting the 'Character code'. Now make that number four digits by preceding it with zeroes as necessary, so looking at the box above the code for the € symbol is 128, (so 0128). Now hold down the Alt key while pressing on the numeric keypad the numbers 0128, now release the Alt key and the € symbol will be displayed at the selected point. (Works in most applications!)