angstrom star

physics. Symbol Å*. 1.000 015 09(90) × 10^-10 m = 100.001 501~ pm with relative standard uncertainty 9.0 × 10^-7.
[Mohr P. J., Taylor B. N. CODATA Recommended Values of the Fundamental Physical Constants: 2002 (to be published)]
[Mohr P. J., Taylor B. N. Rev. Mod. Phys. Vol. 72:351-495 (2000)]
[Mohr P. Phys. Today Vol. 53:7, 11-16 (2000)]
[For latest recommended values, see http://physics.nist.gov/cuu/Constants/index.html] Based on the Kα₁ line of tungsten, Å* is sometimes used for expressing the wavelength of x-rays.