There is not a special name since the graph can represent any function of the form
y = (ax + b)2n where a and b are any real constants and n is any positive integer.
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The bell curve graph is another name for a normal (Gaussian) distribution graph. A Gaussian function is a certain kind of function whose graph results in a bell-shaped curve.
a U shaped graph i mean
That it is non-linear. If it is a graph of a polynomial, it would need to be a polynomial of odd order. But it could be the graph of the tangent function, or a combination of reciprocal functions over a limited domain. In fact the s shaped line, by itself, indicates very little.
Trend Graph
Circle Chart or Circle Graph