nappe

(noun)

One half of a double cone.

Related Terms

Examples of nappe in the following topics:

  • What Are Conic Sections?

    • A cone has two identically shaped parts called nappes.
    • One nappe is what most people mean by “cone,” and has the shape of a party hat.
    • If the plane intersects one nappe at an angle to the axis (other than $90^{\circ}$), then the conic section is an ellipse.
    • The nappes and the four conic sections.