10 (number) is from A different site.It may have some errors because of this wiki system.
angstrom (ăng´strəm), abbr. Å, unit of length equal to 10-10meter (0.0000000001 meter); it is used to measure the wavelengths of visible light and of other forms of electromagnetic radiation, such as ultraviolet radiation and X rays. Scientists now prefer to use the nanometer (nm); 1 nm=10 Å. The angstrom is named in honor of Swedish physicist Anders J. Ångström
MY MY!? It seems that thy article has a bad description/definition! What is up with that?