Multiplier

Noun

1. A number by which another (the multiplicand) is to be multiplied.

   "In the expression 5 × 7, the "5" is a multiplier."

2. An adjective indicating the number of times something is to be multiplied.

   "English multipliers include "double" and "triple"."

3. A ratio used to estimate total economic effect for a variety of economic activities.
4. Any of several devices used to enhance a signal a coil; when Johann Schweigger in 1820 invented the electric coil, increasing the electro-magnetic field from a single wire, this invention was called a multiplier.
5. a coil; when Johann Schweigger in 1820 invented the electric coil, increasing the electro-magnetic field from a single wire, this invention was called a multiplier.