The following symbols and characters can be accessed by holding down the ALT KEY and pressing the numbers on the NUMERIC KEY PAD. This is based on a Times New Roman font set and may differ if a different font is used.
Please not that you must include the initial zero if specified. Omitting the initial zero will result in a different symbol.

For further symbols refer to http://tlt.its.psu.edu/suggestions/international/accents/codealt.html