N unit
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(′en ′yü·nət)
(optics) A unit of index of refraction; a mathematical simplification designed to replace rather awkward numbers involved in the values of the index of refraction n for the atmosphere; it is defined by the relation N=(n-1)106.
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N unit
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radiation physics Various units labelled with a single letter have been used for the biological effects of radiation. All obsolete now, they included e unit equal to the energy ‘liberated in 1 cc by 1 roentgen, which is 82.7 ergs’ and the n unit of twice that.
[Pollard E. C., Davidson W. L. Applied Nuclear Physics (New York: Wiley, 1945)] The E unit appears to have been effectively the e unit per second.
[Glasser O. Physical Foundations of Radiology,
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