a real number despite its sign
The absolute value of a number is the magnitude of a value, ignoring the sign.
Occasionally known as a numerical value, absolutely the value is the non-negative value of a proper quantity regardless of its sign. For example, the absolute worth of both 12 and -12 is 12.
Kirchhoff determined experimentally in a certain case the absolute value of the current induced by one circuit in another, and in the same year Erik Edland (1819-1888) made a series of careful experiments on the induction of electric currents which further established received theories.