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Exameter or examatre is a unit of length equal to 1018meters. This unit is a combination of the metric prefix exa (E) and the SI unit of length meter (m) and its abbreviated as "Em". Plural name is exameters.
The x unit (symbol xu) is a unit of length approximately equal to 0.1 pm (10−13 m). It is used to quote the wavelength of X-rays and gamma rays.