1 (number)

1 (one; /ˈwʌn/ or UK /ˈwɒn/, also called unit, unity, and (multiplicative) identity), is a number, a numeral, and the name of the glyph representing that number. It represents a single entity, the unit of counting or measurement. For example, a line segment of unit length is a line segment of length 1.

As a number

One, sometimes referred to as unity, is the integer before two and after zero. One is the first non-zero number in the natural numbers as well as the first odd number in the natural numbers.

Any number multiplied by one is that number, as one is the identity for multiplication. As a result, one is its own factorial, its own square, its own cube, and so on. One is also the result of the empty product, as any number multiplied by one is itself. It is also the only natural number that is neither composite nor prime with respect to division, but instead considered a unit.

As a digit

The glyph used today in the Western world to represent the number 1, a vertical line, often with a serif at the top and sometimes a short horizontal line at the bottom, traces its roots back to the Indians, who wrote 1 as a horizontal line, much like the Chinese character 一. The Gupta wrote it as a curved line, and the Nagari sometimes added a small circle on the left (rotated a quarter turn to the right, this 9-look-alike became the present day numeral 1 in the Gujarati and Punjabi scripts). The Nepali also rotated it to the right but kept the circle small. This eventually became the top serif in the modern numeral, but the occasional short horizontal line at the bottom probably originates from similarity with the Roman numeral I. In some countries, the little serif at the top is sometimes extended into a long upstroke, sometimes as long as the vertical line, which can lead to confusion with the glyph for seven in other countries. Where the 1 is written with a long upstroke, the number 7 has a horizontal stroke through the vertical line.

Number One (Babylon 5)

Tessa Holloran, also known as Number One, is a recurring fictional character in the television series Babylon 5, and was portrayed by United States actress Marjorie Monaghan. On the show, Number One was initially the leader of the resistance movement on Mars and later became head of covert intelligence for the Interstellar Alliance. During the time frame Babylon 5 takes place, Mars was a human space colony seeking (at times violently) independence from the Earth Alliance, and the issues on the red planet were story elements throughout the Babylon 5 series.

About the character

Number One first appeared in the series during the season 4 episode "Racing Mars", when Dr. Stephen Franklin and Marcus Cole travel to Mars to meet with the resistance leaders there. The names Number One, Number Two, etc. were used on Mars by the resistance to protect the identity of its leaders. Once there, Franklin manages to convince her to stop her fellow members from attacking civilian targets, citing that such acts only weaken their position, and to support Capt. Sheridan's Earth Alliance Civil War civil war efforts against President Clark.

One (disambiguation)

1 A.D. is a year.

1, one, or ONE may also refer to:

Geography

Companies

Grammatical number

In linguistics, grammatical number is a grammatical category of nouns, pronouns, and adjective and verb agreement that expresses count distinctions (such as "one", "two", or "three or more"). In many languages, including English, the number categories are singular and plural. Some languages also have a dual number or other arrangements.

The count distinctions typically, but not always, correspond to the actual count of the referents of the marked noun or pronoun.

The word "number" is also used in linguistics to describe the distinction between certain grammatical aspects that indicate the number of times an event occurs, such as the semelfactive aspect, the iterative aspect, etc. For that use of the term, see "Grammatical aspect".

Overview

Most languages of the world have formal means to express differences of number. One widespread distinction, found in English and many other languages, involves a simple two-way number contrast between singular and plural (car/cars, child/children, etc.). Discussion of other more elaborate systems of number appears below.

Personal Communications Services area codes

Area codes 500, 533, 544, 566 and 577 are non-geographic area codes reserved for personal communications services. The 500 code was authorized by the United States Federal Communications Commission, and introduced into the North American Numbering Plan in 1995.

In 1995 AT&T introduced a "follow-me" service under the brand name of AT&T True Connections using the 500 area code. It was designed to replace the AT&T EasyReach 700 service. Other local exchange carriers and interexchange carriers introduced similar competitive services.

AT&T True Connections service was not well received. Companies, hotels, and others with PBX equipment continued to block the dialing of 500 because it was a caller-paid number. Phone-sex services also began using the 500 prefix and forwarding the calls to various foreign countries.

The 500 prefix is still registered to a variety of phone companies, and is being used for non-geographic services including dial-up modem access.

Non-geographic telephone numbers in the United Kingdom

A non-geographic number is a type of telephone number that is not linked to any specific locality. Such numbers are an alternative to the traditional 'landline' numbers that are assigned geographically using a system of location-specific area codes. Non-geographic numbers are used for various reasons, from providing flexible routeing of incoming phone calls to generating revenue for paid-for services.

Functionality

Non-geographic numbers were introduced to offer services that were historically unavailable on standard landline phone numbers, particularly in terms of call routeing and special charging arrangements. Advertised benefits of non-geographic numbers include:

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Computer science and information technology