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{{#category_index:N|neper}} (nē’ p∂r or nā’ p∂r) A unit for measuring ratios such as voltage ratios. N is the number of nepers if N=ln(V1/V2). It is thus similar to the decibel (q.v.). One neper=8.686 dB. See Figure D-3. Named for John Napier (1550–1617), Scottish mathematician, inventor of logarithms.