In mathematics

• 123 is a Lucas number
  Lucas number
  The Lucas numbers are an integer sequence named after the mathematician François Édouard Anatole Lucas , who studied both that sequence and the closely related Fibonacci numbers...
  
  . It is the eleventh member of the Mian-Chowla sequence

In telephony

• The emergency telephone number
  Emergency telephone number
  Many countries' public telephone networks have a single emergency telephone number, sometimes known as the universal emergency telephone number or occasionally the emergency services number, that allows a caller to contact local emergency services for assistance. The emergency telephone number may...
  
   in Colombia
  Colombia
  Colombia, officially the Republic of Colombia , is a unitary constitutional republic comprising thirty-two departments. The country is located in northwestern South America, bordered to the east by Venezuela and Brazil; to the south by Ecuador and Peru; to the north by the Caribbean Sea; to the...
  
  
• The telephone number
  Telephone number
  A telephone number or phone number is a sequence of digits used to call from one telephone line to another in a public switched telephone network. When telephone numbers were invented, they were short — as few as one, two or three digits — and were given orally to a switchboard operator...
  
   of the speaking clock
  Speaking clock
  A speaking clock service is a recorded or simulated human voice service, usually accessed by telephone, that gives the correct time. The first telephone speaking clock service was introduced in France, in association with the Paris Observatory on 14 February 1933.The format of the service is...
  
   for the correct time
  Time
  Time is a part of the measuring system used to sequence events, to compare the durations of events and the intervals between them, and to quantify rates of change such as the motions of objects....
  
   in the United Kingdom
  United Kingdom
  The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...
  
  
• The electricity emergency telephone number
  Emergency telephone number
  Many countries' public telephone networks have a single emergency telephone number, sometimes known as the universal emergency telephone number or occasionally the emergency services number, that allows a caller to contact local emergency services for assistance. The emergency telephone number may...
  
   in Indonesia
  Indonesia
  Indonesia , officially the Republic of Indonesia , is a country in Southeast Asia and Oceania. Indonesia is an archipelago comprising approximately 13,000 islands. It has 33 provinces with over 238 million people, and is the world's fourth most populous country. Indonesia is a republic, with an...
  
  
• The medical emergency telephone number
  Emergency telephone number
  Many countries' public telephone networks have a single emergency telephone number, sometimes known as the universal emergency telephone number or occasionally the emergency services number, that allows a caller to contact local emergency services for assistance. The emergency telephone number may...
  
   in Egypt
  Egypt
  Egypt , officially the Arab Republic of Egypt, Arabic: , is a country mainly in North Africa, with the Sinai Peninsula forming a land bridge in Southwest Asia. Egypt is thus a transcontinental country, and a major power in Africa, the Mediterranean Basin, the Middle East and the Muslim world...
  
  
• The Notation for national and international telephone numbers Recommendation ITU-T
  ITU-T
  The ITU Telecommunication Standardization Sector is one of the three sectors of the International Telecommunication Union ; it coordinates standards for telecommunications....
  
   Recommendation E.123
  E.123
  E.123, also known as Notation for national and international telephone numbers, e-mail addresses and Web addresses is an ITU-T standard for printed representation of telephone numbers, e-mail addresses, and web addresses.-Example formats:...
  
   defines a standard way to write telephone number
  Telephone number
  A telephone number or phone number is a sequence of digits used to call from one telephone line to another in a public switched telephone network. When telephone numbers were invented, they were short — as few as one, two or three digits — and were given orally to a switchboard operator...
  
  s, e-mail address
  E-mail address
  An email address identifies an email box to which email messages are delivered. An example format of an email address is lewis@example.net which is read as lewis at example dot net...
  
  es, and web addresses

In other fields

• Svea 123
  Svea 123
  The Swedish-made Svea 123 is a small liquid-fuel pressurized-burner camping stove that traces its origins to designs first pioneered in the late 19th century.-History:...
  
   is a small liquid-fuel naphtha
  Naphtha
  Naphtha normally refers to a number of different flammable liquid mixtures of hydrocarbons, i.e., a component of natural gas condensate or a distillation product from petroleum, coal tar or peat boiling in a certain range and containing certain hydrocarbons. It is a broad term covering among the...
  
  , referred to as “white gas” or “Coleman
  Coleman Company
  Coleman Company, Inc., is an American company that specializes in outdoor recreation products. Historically, Coleman is known for camping gear....
  
   fuel”
• The atomic number
  Atomic number
  In chemistry and physics, the atomic number is the number of protons found in the nucleus of an atom and therefore identical to the charge number of the nucleus. It is conventionally represented by the symbol Z. The atomic number uniquely identifies a chemical element...
  
   of the yet-to-be-discovered element unbitrium
• Japan Airlines Flight 123
  Japan Airlines Flight 123
  Japan Airlines Flight 123 was a Japan Airlines domestic flight from Tokyo International Airport to Osaka International Airport on August 12, 1985. The Boeing 747-146SR that made this route, registered , suffered mechanical failures 12 minutes into the flight and 32 minutes later crashed into two...
  
  , world's deadliest single-aircraft accident in history

See also

• 1-2-3 (disambiguation)
• 123rd (disambiguation)
• List of highways numbered 123
• Section 123 Agreement of the U.S. Atomic Energy Act of 1954
  Section 123 Agreement
  Section 123 of the United States Atomic Energy Act of 1954, titled "Cooperation With Other Nations", establishes an agreement for cooperation as a prerequisite for nuclear deals between the US and any other nation. Such an agreement is called a 123 Agreement. To date, the U.S. has entered into...
  
  
• United Nations Security Council Resolution 123
  United Nations Security Council Resolution 123
  United Nations Security Council Resolution 123 was adopted on February 21, 1957 after the conflict over Jammu and Kashmir intensified. The council requested that the President of the Security Council visit the subcontinent and, along with the governments of India and Pakistan, examine any proposals...
  
  
• Raz, Dwa, Trzy
  Raz, Dwa, Trzy
  Raz, Dwa, Trzy is a Polish music band, which joins rock, jazz and folk with contemporary poetry. It was founded in February 1990 by students of the Pedagogical College in Zielona Góra...
  
  , Polish music band
• Raz, dwa, trzy (newspaper)
  Raz, dwa, trzy (newspaper)
  Raz, dwa, trzy was a Polish sports weekly, published in the interbellum period in Kraków, by the Ilustrowany Kurier Codzienny publishing house. Its first issue came out on April 21, 1931, the last one was printed in late August 1939. Following German and Soviet aggression on Poland, the weekly...
  
  , Polish sports weekly
• Sonnet 123
  Sonnet 123
  Sonnet 123 is one of 154 sonnets written by the English playwright and poet William Shakespeare. It is a member of the Fair Youth sequence, in which the poet expresses his love towards a young man.-Synopsis:...
  
   by William Shakespeare
  William Shakespeare
  William Shakespeare was an English poet and playwright, widely regarded as the greatest writer in the English language and the world's pre-eminent dramatist. He is often called England's national poet and the "Bard of Avon"...
  
  
• The Lotus 1-2-3
  Lotus 1-2-3
  Lotus 1-2-3 is a spreadsheet program from Lotus Software . It was the IBM PC's first "killer application"; its huge popularity in the mid-1980s contributed significantly to the success of the IBM PC in the corporate environment.-Beginnings:...
  
   spreadsheet
  Spreadsheet
  A spreadsheet is a computer application that simulates a paper accounting worksheet. It displays multiple cells usually in a two-dimensional matrix or grid consisting of rows and columns. Each cell contains alphanumeric text, numeric values or formulas...
  
  program