S Curve

S-curve to left warning sign.	S-curve to right warning sign.
Sharp S-curve to left warning sign.	Sharp S-curve to right warning sign.
The Sigmond Curve or S-Curve in mathematics resembles the S-curve of topology and civil engineering usages.

S curve or S-curve can refer to:

• S Curve (art), an art term for a sinuous body form — the S Curve is a traditional art concept common in Ancient Greek and Roman sculpture where the figure's body and posture is depicted like a sinuous or serpentine "S".

• S-Curve Records, a record company label

• S-Curve in math: the shape of the logistic function used to illustrate the diffusion of innovations in the technology life cycle. Also known as the Sigmoid curve from the sigmoid function, a mathematical function that produces a sigmoid, or "S"-shaped, curve.

• S curve (north American usages) or reverse curve (British English usages), in civil engineering, a section of the horizontal alignment of a highway or railroad route in which a curve to the left or right is followed immediately by a curve in the opposite direction.