A shuttlecock ( often abbreviated to shuttle ; also called a birdie ) is a high-drag projectile, with an open conical shape: the cone is formed from sixteen overlapping feathers embedded into a rounded cork base.

* Hertzian cone, the cone of force that propagates through a brittle, amorphous or cryptocrystalline solid material from a point of impact

* Spinning cone columns are used in a form of steam distillation to gently extract volatile chemicals from liquid foodstuffs

* Ionization cone, cones of material extending out from spiral galaxies

* Cinder cone, a steep conical hill of volcanic fragments around and downwind from a volcanic vent

As ejecta escapes from the growing crater, it forms an expanding curtain in the shape of an inverted cone ; the trajectory of individual particles within the curtain is thought to be largely ballistic.

In mathematics, an ellipse ( from Greek ἔλλειψις elleipsis, a " falling short ") is a plane curve that results from the intersection of a cone by a plane in a way that produces a closed curve.

Ellipses are closed curves and are the bounded case of the conic sections, the curves that result from the intersection of a circular cone and a plane that does not pass through its apex ; the other two ( open and unbounded ) cases are parabolas and hyperbolas.

Petrified cone of Araucaria mirabilis from Patagonia, Argentina dating from the Jurassic | Jurassic Period ( approx.

The third feature helps to boost the light emission from the semiconductor by acting as a diffusing lens, allowing light to be emitted at a much higher angle of incidence from the light cone than the bare chip is able to emit alone.

In vertebrates, landmarks of embryonic neural development include the birth and differentiation of neurons from stem cell precursors, the migration of immature neurons from their birthplaces in the embryo to their final positions, outgrowth of axons from neurons and guidance of the motile growth cone through the embryo towards postsynaptic partners, the generation of synapses between these axons and their postsynaptic partners, and finally the lifelong changes in synapses which are thought to underlie learning and memory.

Ptolemy, in his treatise Optics, held an extramission-intromission theory of vision: the rays ( or flux ) from the eye formed a cone, the vertex being within the eye, and the base defining the visual field.

He held an extramission-intromission theory of vision: the rays ( or flux ) from the eye formed a cone, the vertex being within the eye, and the base defining the visual field.

Just as the simple curves in the plane can be obtained as sections from a three-dimensional double cone, so too various ( aperiodic or periodic ) arrangements in two and three dimensions can be obtained from postulated hyperlattices with four or more dimensions.

Western raku is typically made from a stoneware clay body, bisque fired at and glaze fired ( the final firing ) between, which falls into the cone 06 firing temperature range.

In resonator guitars, rather than the sound being produced by the body's hollow, a special bridge transfers the vibrations from the strings to a metal cone placed inside the body.

It has an open conical shape: the cone is formed from sixteen or so overlapping feathers, usually goose or duck and from the left wing only, embedded into a rounded cork base.

** Conon of Samos, Greek mathematician and astronomer whose work on conic sections ( curves of the intersections of a right circular cone with a plane ) serves as the basis for the fourth book of the Conics of Apollonius of Perga ( b. c. 280 BC )

* Conon of Samos, Greek mathematician and astronomer whose work on conic sections ( curves of the intersections of a right circular cone with a plane ) serves as the basis for the fourth book of the Conics of Apollonius of Perga ( b. c. 280 BC )

In Greek mythology, a thyrsus or thyrsos () was a staff of giant fennel ( Ferula communis ) covered with ivy vines and leaves, sometimes wound with taeniae and always topped with a pine cone.

Keratoconus ( from Greek: kerato-horn, cornea ; and konos cone ) is a degenerative disorder of the eye in which structural changes within the cornea cause it to thin and change to a more conical shape than its normal gradual curve.

The name Zamia comes from the Greek azaniae, meaning " a pine cone ".

This root is considered to stem from Indo-European * k ^ óss meaning " pine, conifer ", akin to Russian sosná " pine ", Greek kônos " pinecone, pine-seed, cone ", kôna " pitch ", kýneion " hemlock ; giant fennel ", Oroshi sānĵ " post ".

Its name comes from Greek ( mikros meaning " small " and strobos " cone ").

The genus name comes from the Ancient Greek word Strobilos ( στρόβιλος ), meaning " pine cone ", a reference to the appearance of S. strobilaceus.

The botanical term galbulus ( plural galbuli ; from the Latin for a cypress cone ) is sometimes used instead of strobilus for members of this family.

At the point where the pia mater reaches the conus medullaris or medullary cone at the end of the spinal cord, the membrane extends as a thin filament called the filum terminale or terminal filum, contained within the lumbar cistern.

They have an easily recognizable slender feather-shaped gladius with a hollow cone structure ( the primary conus ).

Since a ruled surface of order N with N concurrent generators is necessarily a cone, it follows finally that every line through a point, P, of **zg meets its image at P, as asserted.

Moreover, in this involution there is a cone of invariant lines of order Af, namely the cone of secants of **zg which pass through P.

For a solid shape such as a sphere, cone, or cylinder, the area of its boundary surface is called the surface area.

Morphologically, the breast is a cone with the base at the chest wall, and the apex at the nipple, the center of the NAC ( nipple-areola complex ).

When a symbol is not marked by any of the three grammar symbols ( square, cone, inverted cone ), they may be a non material thing, a grammatical particle, etc.

* Convex cone, a subset C of a vector space V is a convex cone if αx + βy belongs to C, for any positive scalars α, β, and any x, y in C

* Parasitic cone ( or satellite cone ) is a geographical feature found around a volcano

* Ice cream cone, an edible container in which ice cream is served, shaped like an inverted cone open at its top

If a source emits a known luminous intensity I < sub > v </ sub > ( in candelas ) in a well-defined cone, the total luminous flux Φ < sub > v </ sub > in lumens is given by

where A is the radiation angle of the lamp — the full vertex angle of the emission cone.

The memorial is a fountain in the form of a round stone inverted cone.

It is instead often topped with an inverted frustum of a shallow cone or a cylindrical band of carvings.

The thickest, strongest, and closed part of the cone is located near the explosive charge.

A typical result is the 1: 3 ratio between the volume of a cone and a cylinder with the same height and base.

Kolo is a roasted barley snack food often served in a paper cone.