Wedge (symbol)

Wedge (∧) is a symbol used to represent:

In Unicode the symbol is encoded U+2227 ∧ LOGICAL AND (HTML ∧ · ∧) and by \wedge and \land in TeX. The opposite symbol (∨) is called a vel, or sometimes a (descending) wedge. Some authors who call the descending wedge 'vel' often call the ascending wedge ac (the corresponding Latin word for "and", also spelled "atque") keeping their usage parallel.

The wedge looks similar to the caret (^).

See also

Submarine sandwich

A submarine sandwich, also known as a sub, wedge, hoagie, hero, grinder, or one of the many regional naming variations, is a type of sandwich that consists of a long roll of bread split widthwise into two pieces, and filled with a variety of meats, cheeses, vegetables, seasonings, and sauces. The sandwich has no standardized name, and many U.S. regions have their own names for it; one study found 13 different names for the sandwich in the United States. The usage of the several terms varies regionally but not in any pattern, as they have been used variously by the people and enterprises who make and sell them. The terms submarine and sub are widespread and not assignable to any certain region, though many of the localized terms are clustered in the northeastern United States.

History and etymology

The sandwich originated in several different Italian American communities in the Northeastern United States from the late 19th to mid-20th centuries. Portland, Maine claims to be the birthplace of the "Italian sandwich" and it is considered Maine's signature sandwich. The popularity of this Italian-American cuisine has grown from its origins in Connecticut, Pennsylvania, Delaware, New York, New Jersey, and Massachusetts to most parts of the United States, Canada, and with the advent of chain restaurants, is now available in many parts of the world.

Wedge prism

The wedge prism is a prism with a shallow angle between its input and output surfaces. This angle is usually 3 degrees or less. Refraction at the surfaces causes the prism to deflect light by a fixed angle. When viewing a scene through such a prism, objects will appear to be offset by an amount that varies with their distance from the prism.

Deflection angle

For a wedge prism in air, rays of light passing through the prism are deflected by the angle δ, which is approximately given by

where n is the index of refraction of the prism material, and α is the angle between the prism's surfaces.

Applications

The term "optical wedge" refers to any shallow angle between two plane surfaces of a window. This wedge may range from a few millionths of a degree of perfect parallelism to as much as three degrees of angle. Even though high-precision optics, such as optical flats, may be lapped and polished to extremely high levels of parallelism, nearly all optics with parallel faces have some slight wedge. This margin of error is usually listed in minutes or seconds of arc. Windows manufactured with an intentional wedge are often referred to as wedge prisms, and typically come with wedge angles of one, two, or three degrees. Many applications exist for wedge prisms, including laser-beam steering, rangefinding and variable focusing.

Wedge (mechanical device)

A wedge is a triangular shaped tool, and is a portable inclined plane, and one of the six classical simple machines.It is thick at one end and thin at the other end. It can be used to separate two objects or portions of an object, lift up an object, or hold an object in place. It functions by converting a force applied to its blunt end into forces perpendicular (normal) to its inclined surfaces. The mechanical advantage of a wedge is given by the ratio of the length of its slope to its width. Although a short wedge with a wide angle may do a job faster, it requires more force than a long wedge with a narrow angle.

History

Perhaps the first example of a wedge is the hand axe, also see biface and Olorgesailie. Wedges have been around for thousands of years, they were first made of simple stone. A hand axe is made by chipping stone, generally flint, to form a bifacial edge, or wedge. A wedge is a simple machine that transforms lateral force and movement of the tool into a transverse splitting force and movement of the workpiece. The available power is limited by the effort of the person using the tool, but because power is the product of force and movement, the wedge amplifies the force by reducing the movement. This amplification, or mechanical advantage is the ratio of the input speed to output speed. For a wedge this is given by 1/tanα, where α is the tip angle. The faces of a wedge are modeled as straight lines to form a sliding or prismatic joint.

Symbol

A symbol is a person or a concept that represents, stands for or suggests another idea, visual image, belief, action or material entity. Symbols take the form of words, sounds, gestures, ideas or visual images and are used to convey other ideas and beliefs. For example, a red octagon may be a symbol for "STOP". On a map, a blue line might represent a river. Numerals are symbols for numbers. Alphabetic letters may be symbols for sounds. Personal names are symbols representing individuals. A red rose may symbolize love and compassion. The variable x in a mathematical equation may symbolize the position of a particle in space.

In cartography, an organized collection of symbols forms a legend for a map.

Etymology

The word derives from the Greek symbolon (σύμβολον) meaning token or watchword. It is an amalgam of syn- "together" + bole "a throwing, a casting, the stroke of a missile, bolt, beam." The sense evolution in Greek is from "throwing things together" to "contrasting" to "comparing" to "token used in comparisons to determine if something is genuine." Hence, "outward sign" of something. The meaning "something which stands for something else" was first recorded in 1590, in Edmund Spenser's Faerie Queene.

Symbol (choir)

The Symbol is a choir in Romania that links to the great choir of the patriarchy of the Romanian Orthodox Church. Its headquarters are in the basement or the patriarchal palace in the choir room named after the mentor of the choir Nicolae Lungu.

Founder and Conductors

The one who founded the choir is also the current conductor, Mr. Jean Lupu, currently 69 years old.

Excerpt from the 15-year album of the choir:

"Professor Jean Lupu, the founder and also the choir conductor, is a graduate of the Orthodox Theological Seminary in Craiova, the 'Radu Greceanu' High-school in Slatina and later, the National Academy of Music in Timişoara and Bucharest."

The one who is responsible for the funds distribution and management is Mrs. Doinița Neamțu. The president of the directorial council is Mrs. Aureliana Grama.

The assistant conductor is Luminița Gutanu, Doctor in Music, graduate of the National Music Institute in Kishinev, Republic of Moldova.

Repertory

The repertory comprises more than 250 compositions, 25% being the work of the choir's mentor.

Symbol (disambiguation)

A symbol is something that represents an idea, a process, or a physical entity.

Symbol may also refer to:

Computing

Logic

Music