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A cone is a basic shape in geometry. Several things have also been called cones on account of their shape:
- An ice cream cone is a container for ice cream, shaped like an inverted cone open at its base. It is often made of edible pastry.
- The scaly fruit-like reproductive bodies of certain plants, especially pines and cycads, are called cones: see conifer, conifer cone, and pinophyta.
- A volcanic cone is a mountain formed by material ejected from a volcanic vent.
- In relativity, the light cone of an event consists of all spacetime events that can interact with it.
- In vertebrate anatomy, a cone cell is a type of light-sensitive cell found along with rods in the retina of the eye.
- In ceramics manufacture, a cone is a conical or pyramidal mineral stick that is used to gauge the temperature of an oven.
- A traffic cone is a brightly colored cone-shaped plastic object commonly used as a temporary traffic barrier or warning sign.
- In basketball, a cone is a player who is so slow and unskilled, that you can dribble around them as if they were a plastic cone.
The word cone and its derivatives also have several specialized meanings in mathematics:
- In geometry, cone is often used informally for conical surface, usually a right circular one; see cone (geometry).
- Also in geometry, the cone of an arbitrary set <math>X<math> means the union of all line segments connecting a fixed point to points of <math>X<math>. For exmple, this coning operation will turn a triangle into a tetrahedron.
- In topology, too, coning may be applied to a topological space, e.g. to define the barycentric subdivision of a cell complex; see cone (topology).
- In linear algebra, the convex cone of a set of vectors consists of all linear combinations of those vectors with non-negative coefficients.
- In descriptive geometry, "conical projection" is another name for the perspective projection.
- In cartography, however, a conical projection maps the spherical surface of the Earth to a conical surface, that is then unrolled onto a plane.
- A conic section is any curve obtained by cutting the surface of a cone (more precisely, a conical surface) by an arbitrary plane.
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