Spline -- from Wolfram MathWorld

A piecewise polynomial function that can have a locally very simple form, yet at the same time be globally flexible and smooth. Splines are very useful for modeling arbitrary functions, and are used extensively in computer graphics. Cubic splines are implemented in the Wolfram Language as BSplineCurve[pts, SplineDegree -> 3] (red), Bézier curves as BezierCurve[pts] (blue), and B-splines as BSplineCurve[pts].

Arbitrarily Accurate Spline Based Approximations for the Hyperbolic Tangent Function and Applications

Taylor Series, PDF, Mathematical Relations

Steinmetz Solid - From Wolfram MathWorld, PDF, Mathematics

23.area Under Curve, PDF, Area

Create Graphics with Spline Primitives—Wolfram Language Documentation

PDF) Cubic Spline -- From Wolfram MathWorld

Create Graphics with Spline Primitives—Wolfram Language Documentation

Line -- from Wolfram MathWorld, line

What software do you use for showing graphs and equations? - Quora

Steinmetz Solid - From Wolfram MathWorld, PDF, Mathematics

Create Graphics with Spline Primitives—Wolfram Language Documentation

B-Spline -- from Wolfram MathWorld

Torispherical Dome - From Wolfram MathWorld, PDF, Sphere

Line -- from Wolfram MathWorld, line