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.

No.1 (Uverworld song)

No.1 is a Japanese-language song, and the seventeenth single, by the Japanese band Uverworld and was released on November 19, 2008. This song was also perform at Tokyo Dome as a leading track for Last Tour Final. Limited edition version contains Three live song footage at Zepp Tokyo from Last Tour 2010.

Track listing

CD

DVD

Personnel

One (disambiguation)

1 A.D. is a year.

1, one, or ONE may also refer to:

Geography

Companies

Rule No. 1

Rule #1 is a 2008 Hong Kong horror film directed by Kelvin Tong and starring Shawn Yue, Ekin Cheng, Stephanie Che and Fiona Xie.

Plot

While on duty during an assignment, young sergeant Lee Kwok-keung (Shawn Yue) shot and killed serial killer Chan Fuk-loi (Ben Yuen) after he had his four limbs crippled by Chan. Forty nine days later, Lee woke up in the hospital but his testimony was not recognized by the police because of his description which contains some supernatural things. His superior then transferred him to the Miscellaneous Affairs Department to let him rest.

Unlike the heroic duty of fighting crime and protecting citizens, the Miscellaneous Affairs deals with unusual cases, which is intriguing and makes people feel lost. The head of the Miscellaneous Affairs, Inspector Wong Yiu-fai (Ekin Cheng), is an eccentric and beer-guzzling man. Wong and Lee work together for the Miscellaneous Affairs to solve an unusual request: to eliminate the fear of every citizen seeking help. While carrying out their duties, Wong pretentiously tells Lee the first commandment of the Miscellaneous Affairs: There are no ghosts in this world! In fact, this first commandment is just a lie. The primary task for the Miscellaneous Affairs of dealing unusual cases is to conceal supernatural incidents to the community to reduce social panic.