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Nonlinear
A scale that is nonlinear. ~
Linear. The only power for the variables is 1.
To be linear, there should only be constants, and variables with constant coefficients. No powers of variables, or numbers raised to the power of a variable, or any other nonlinear function such as log, ln, sin, cos, tan, cosh, etc.
Nonlinear can be only positive or only negative, or switch between the two over its domain.