A Cone

(geometry) A surface of revolution formed by rotating a segment of a line around another line that intersects the first line. https://en.wikipedia.org/wiki/Cone
(geometry) A solid of revolution formed by rotating a triangle around one of its altitudes. Volcanic cone - Wikipedia
(topology) A space formed by taking the direct product of a given space with a closed interval and identifying all of one end to a point.
Anything shaped like a cone.^[1] Volcanic cone - Wikipedia
The fruit of a conifer.^[1]

A cone-shaped flower head of various plants, such as banksias and proteas.
An ice cream cone.^[1]
A traffic cone
A unit of volume, applied solely to marijuana and only while it is in a smokable state; roughly 1.5 cubic centimetres, depending on use.
(anatomy) Any of the small cone-shaped structures in the retina.^[1]
(slang) The bowl piece on a bong.
(slang) The process of smoking cannabis in a bong.
(slang) A cone-shaped cannabis joint.
(slang) A passenger on a cruise ship (so-called by employees after traffic cones, from the need to navigate around them)
(category theory) An object V together with an arrow going from V to each object of a diagram such that for any arrow A in the diagram, the pair of arrows from V which subtend A also commute with it. (Then V can be said to be the cone’s vertex and the diagram which the cone subtends can be said to be its base.)
A shell of the genus Conus, having a conical form.
A set of formal languages with certain desirable closure properties, in particular those of the regular languages, the context-free languages and the recursively enumerable languages. Cone (formal languages) - Wikipedia

Volume of a cone is given by:

\[V=\frac {\pi}3 r^2 h^3\]