neper a unit of level of a field quantity when the logarithm is on the Neperian base e which is equal to 2.7. Also, unit of level of a power-like quantity when the logarithm is on the base the square of e which is equal to 7.389 GRM: n. SBL/EXP: Np Note: non SI unit; one decineper is one tenth of a neper, one neper equals 8.686 decibels References: SEEbel