By A Mystery Man Writer
Bell-shaped function
algebra precalculus - Is there a bell-curve-like function where n and m control the curve shape between 0 and 1? - Mathematics Stack Exchange
Bell-shaped function with width a = 3, center c = 0 and different slope
Bellsham Facebook, Instagram & Twitter on PeekYou
Sample general bell-shaped membership function.
Beta Distribution — Intuition, Examples, and Derivation, by Ms Aerin
Normal distribution - Wikipedia
Laffer curve - Wikipedia
File:IQ curve.svg - Wikipedia