Ångström
An ångström (symbol Å) was a unit of length equal to 10−10 meters, used principally to express the wavelengths of electromagnetic radiation. It was equivalent to 0.1 nanometer.

Comparative units of length
 While attempting to initialize the transporters aboard , Harry Kim aligned the confinement beam to 10 ångströms. ()

 A computer analysis of the Murasaki 312 yielded a radiation wave length of 370 ångströms. ()

 While analyzing the Cytherian probe, Reginald Barclay noted that the sensors were up visual wavelengths between 4,500 and 7,000 ångströms. ()

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Angström