# Definition:Cone/Double Napped Cone

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## Definition

A **double napped cone** is a cone where the lines joining the apex to the circumference of the base extend indefinitely in either dimension:

### Nappe

Each of the halves of a double napped cone is a **nappe**.

## Also known as

A **double napped cone** is also known as a **double cone**.

## Also see

## Sources

- Weisstein, Eric W. "Double Cone." From
*MathWorld*--A Wolfram Web Resource. http://mathworld.wolfram.com/DoubleCone.html