Exponential.

Exponential functions are functions of the base of natural logarithms e.

Exponential Growth shows the steep rise if the basic function f(x) = exp(x).

Exponential Decay shows the way a value decays asymptotically towards zero from a starting value. Both of these occur in almost every aspect of engineering and physics.

Catenary or hyberbolic cosine is an exponential function which describes the shape of a string or chain suspended between two supports, for example a suspension bridge.

Hyperbolic sine (sinh) is an exponential function similar to its trigonometric counterpart.