Chemistry

• CAS registry number
  CAS registry number
  CAS Registry Numbersare unique numerical identifiers assigned by the "Chemical Abstracts Service" toevery chemical described in the...
  
  s for chemical compounds
• EC number
  EC number
  The Enzyme Commission number is a numerical classification scheme for enzymes, based on the chemical reactions they catalyze....
  
  s for identifying enzyme
  Enzyme
  Enzymes are proteins that catalyze chemical reactions. In enzymatic reactions, the molecules at the beginning of the process, called substrates, are converted into different molecules, called products. Almost all chemical reactions in a biological cell need enzymes in order to occur at rates...
  
  s
• UN number
  UN number
  UN numbers or UN IDs are four-digit numbers that identify hazardous substances, and articles in the framework of international transport....
  
  s for (classes of) hazardous substances
• E number
  E number
  E numbers are number codes for food additives that have been assessed for use within the European Union . They are commonly found on food labels throughout the European Union. Safety assessment and approval are the responsibility of the European Food Safety Authority...
  
  s for food additive
  Food additive
  Food additives are substances added to food to preserve flavor or enhance its taste and appearance.Some additives have been used for centuries; for example, preserving food by pickling , salting, as with bacon, preserving sweets or using sulfur dioxide as in some wines...
  
  s

Communications

• The E.164
  E.164
  E.164 is an ITU-T recommendation that defines the international public telecommunication numbering plan used in the PSTN and some other data networks. It also defines the format of telephone numbers. E.164 numbers can have a maximum of fifteen digits and are usually written with a + prefix...
  
   numbering plan for telephone
  Telephone
  The telephone , colloquially referred to as a phone, is a telecommunications device that transmits and receives sounds, usually the human voice. Telephones are a point-to-point communication system whose most basic function is to allow two people separated by large distances to talk to each other...
  
   numbers, including:
  • Country calling codes
  • North American Numbering Plan
    North American Numbering Plan
    The North American Numbering Plan is an integrated telephone numbering plan administered by Neustar which encompasses 24 countries and territories, including the United States and its territories, Canada, Bermuda, and 16 nations of the Caribbean...
    
    
  • Numbering plans by country
    Telephone numbering plan
    A telephone numbering plan is a type of numbering scheme used in telecommunications to allocate telephone numbers to subscribers and to route telephone calls in a telephone network. A closed numbering plan, such as found in North America, imposes a fixed total length to numbers...
    
    
    • Argentina: Argentine telephone numbering plan
      Argentine telephone numbering plan
      Phone numbers in Argentina have ten digits, if both the area code and the subscriber's code are included. The area code may have 2, 3 or 4 digits, with the remaining 8, 7 or 6 digits being the subscriber's number...
      
      
    • Australia: Australian telephone numbering plan
      Australian telephone numbering plan
      Country Code: +61International Call Prefix: 0011Trunk Prefix: 0The Australian telephone numbering plan describes the allocation of phone numbers in Australia...
      
      
    • China: China telephone numbering plan
      China telephone numbering plan
      Country Code: +86International Call Prefix: 00Trunk Prefix: 0The Chinese Telephone Code Plan is the way to group telephone numbers of Mainland China...
      
      
    • France: French telephone numbering plan
      French telephone numbering plan
      The French telephone numbering plan is not only used for metropolitan France but also for the French overseas departments and some overseas collectivities. October 25 1985, France changed to a "closed" telephone numbering plan, with the area code incorporated into the subscriber's eight-digit number...
      
      
    • Hong Kong: Hong Kong telephone numbering plan
      Hong Kong telephone numbering plan
      Country Code: +852International Call Prefix: 001 and others.Trunk Prefix: noneTelephone numbers in Hong Kong are mostly eight-digit. Fixed land line numbers start with 2 or 3, cellular phone numbers with 5, 6 or 9, pager numbers with 7 and forwarding service with 8...
      
      
    • Japan: Japanese telephone numbering plan
      Japanese telephone numbering plan
      Country Code: +81International Call Prefix: 010Trunk Prefix: 0-Dialing prefixes: 00 Carrier selection prefix 184 Prefix to withhold caller ID 186 Prefix to provide caller ID-Types of numbers:...
      
      
    • Singapore: Singapore telephone numbering plan
      Singapore telephone numbering plan
      Country Code: +65International Call Prefix: 001 or 002 or 008Trunk Prefix: noneThe Singapore telephone numbering plan, also known as the National Numbering Plan, is regulated by the Numbering Management Department of the Infocomm Development Authority of Singapore , taking over the role from the...
      
      
    • United Kingdom: UK telephone numbering plan
      UK telephone numbering plan
      The UK telephone numbering plan, also known as the National Telephone Numbering Plan, is the system used for assigning telephone numbers in the United Kingdom and the Crown Dependencies...
      
      
• The IP address
  IP address
  An Internet Protocol address is a numerical label assigned to each device participating in a computer network that uses the Internet Protocol for communication. An IP address serves two principal functions: host or network interface identification and location addressing...
  
   allocation scheme (IANA
  Internet Assigned Numbers Authority
  The Internet Assigned Numbers Authority is the entity that oversees global IP address allocation, autonomous system number allocation, root zone management in the Domain Name System , media types, and other Internet Protocol-related symbols and numbers...
  
  )
• The DNIC prefixes of X.25
  X.25
  X.25 is an ITU-T standard protocol suite for packet switched wide area network communication. An X.25 WAN consists of packet-switching exchange nodes as the networking hardware, and leased lines, Plain old telephone service connections or ISDN connections as physical links...
  
   NUAs assigned by the ITU
  International Telecommunication Union
  The International Telecommunication Union is the specialized agency of the United Nations which is responsible for information and communication technologies...
  
   http://www.itu.int

Locations

• Postal code
  Postal code
  A postal code is a series of letters and/or digits appended to a postal address for the purpose of sorting mail. Once postal codes were introduced, other applications became possible.In February 2005, 117 of the 190 member countries of the Universal Postal Union had postal code systems...
  
  s
  • ZIP code
    ZIP Code
    ZIP codes are a system of postal codes used by the United States Postal Service since 1963. The term ZIP, an acronym for Zone Improvement Plan, is properly written in capital letters and was chosen to suggest that the mail travels more efficiently, and therefore more quickly, when senders use the...
    
    s
• Global Location Number
  Global Location Number
  The Global Location Number is part of the GS1 systems of standards. It is a simple tool used to identify a location and can identify locations uniquely where required.The GS1 Identification Key used to identify physical locations or legal entities...
  
  s by GS1
  GS1
  Founded in 1977, GS1 is an international not-for-profit association dedicated to the development and implementation of global standards and solutions to improve the efficiency and visibility of supply and demand chains globally and across multiple sectors...
  
  
• Road numbering schemes
  • Arlington County, Virginia, street-naming system
    Arlington County, Virginia, street-naming system
    This article details the street-naming system of Arlington County, Virginia in the United States.Although the streets of Arlington County are not laid out on a grid plan, its local streets follow sequential numbered or alphabetic patterns that are both rational and provide address numbering...
    
    
  • Great Britain road numbering scheme
    Great Britain road numbering scheme
    The Great Britain road numbering scheme is a numbering scheme used to classify and identify all roads in Great Britain. Each road is given a single letter, which represents the road's category, and a subsequent number, with a length of between 1 and 4 digits. Originally introduced to arrange...
    
    
  • European route by UNECE
    United Nations Economic Commission for Europe
    The United Nations Economic Commission for Europe was established in 1947 to encourage economic cooperation among its member states. It is one of five regional commissions under the administrative direction of United Nations headquarters. It has 56 member states, and reports to the UN Economic and...
    
    
  • Interstate highway
  • Edmonton, Alberta#Street layout
  • Montreal
  • Highways in Australia#Route numbering systems
• FIPS place codes
• House numbering
  House numbering
  House numbering is the system of giving a unique number to each building in a street or area, with the intention of making it easier to locate a particular building. The house number is often part of a postal address....
  
   schemes
• Floor numbering
• Room number
  Room number
  A room number is a number assigned to a room within a building. Its purpose is to identify a particular room, and help visitors locate that room. Room numbers may consist of three digits, but can be any number of digits....
  
  
• line number
  Line number
  In computing, a line number is a method used to specify a particular sequence of characters in a text file. The most common method of assigning numbers to lines is to assign every line a unique number, starting at 1 for the first line, and incrementing by 1 for each successive line.In the C...
  
  

Products

• The GS1
  GS1
  Founded in 1977, GS1 is an international not-for-profit association dedicated to the development and implementation of global standards and solutions to improve the efficiency and visibility of supply and demand chains globally and across multiple sectors...
  
   numbering scheme, including
  • GTIN for products, which includes the UPC
    Universal Product Code
    The Universal Product Code is a barcode symbology , that is widely used in North America, and in countries including the UK, Australia, and New Zealand for tracking trade items in stores. Its most common form, the UPC-A, consists of 12 numerical digits, which are uniquely assigned to each trade item...
    
     and EAN-13 barcode
    Barcode
    A barcode is an optical machine-readable representation of data, which shows data about the object to which it attaches. Originally barcodes represented data by varying the widths and spacings of parallel lines, and may be referred to as linear or 1 dimensional . Later they evolved into rectangles,...
    
    s
  • ISBN codes for books
  • ISSN codes for periodicals
• Vehicle identification number
  Vehicle identification number
  A Vehicle Identification Number, commonly abbreviated to VIN, is a unique serial number used by the automotive industry to identify individual motor vehicles. VINs were first used in 1954...
  
  

People

• National identification numbers
  • Personal identification number (Denmark)
    Personal identification number (Denmark)
    The Danish Personal Identification number is a national identification number, which is part of the personal information stored in the Civil Registration System ....
    
    
  • Social Security number (United States)
  • Social Insurance Number
    Social Insurance Number
    A social insurance number is a number issued in Canada to administer various government programs. The SIN was created in 1964 to serve as a client account number in the administration of the Canada Pension Plan and Canada's varied employment insurance programs. In 1967, Revenue Canada started...
    
     (Canada)
  • INSEE
    INSEE
    INSEE is the French National Institute for Statistics and Economic Studies. It collects and publishes information on the French economy and society, carrying out the periodic national census. Located in Paris, it is the French branch of Eurostat, European Statistical System...
    
     number (France)
  • National Insurance
    National Insurance
    National Insurance in the United Kingdom was initially a contributory system of insurance against illness and unemployment, and later also provided retirement pensions and other benefits...
    
     number (United Kingdom)
• Personal Public Service Number
  Personal Public Service Number
  The Personal Public Service Number is an identifier issued by Client Identity Services, Department of Social and Family Affairs on behalf of the Minister for Social and Family Affairs in Ireland....
  
   (Republic of Ireland)
• Tax File Number
  Tax File Number
  Tax File Number is an 8 or 9 digit number issued by the Australian Taxation Office to each taxpayer to identify that taxpayer's Australian tax dealings. When it was introduced in 1988, individuals received a 9 digit TFN and non-individuals were issued an 8 digit TFN. Now both are issued 9 digit...
  
   (Australia)
• AADHAAR
  Unique Identification Authority of India
  The Unique Identification Authority of India , is an agency of the Government of India responsible for implementing the AADHAAR scheme, a unique identification project. It was established in February 2009, and will own and operate the Unique Identification Number database...
  
  --a unique identification project in India
• Permanent account number
  Permanent account number
  Permanent Account Number is unique alphanumeric combination issued to all juristic entities identifiable under the Indian Income Tax Act 1961. It is issued by the Indian Income Tax Department under the supervision of the Central Board for Direct Taxes and is almost equivalent to a national...
  
   (India)
• Unique Master Citizen Number
  Unique Master Citizen Number
  Unique Master Citizen Number was a unique identification number that was assigned to every citizen of former Yugoslav republics of the SFR Yugoslavia. Today it continues to be used in all of the countries that were created after the dissolution of Yugoslavia – Bosnia and Herzegovina, Croatia,...
  
   (former Yugoslavia)
• Det Centrale Personregister
  Det Centrale Personregister
  Det Centrale Personregister , short CPR is a Danish nationwide centralised register of personal information.Established in 1968, the register contains information concerning the name, address, Danish personal identification number, date and place of birth, citizenship and other associated information...
  
   (Denmark)

Topics

• Dewey Decimal Classification
  Dewey Decimal Classification
  Dewey Decimal Classification, is a proprietary system of library classification developed by Melvil Dewey in 1876.It has been greatly modified and expanded through 23 major revisions, the most recent in 2011...
  
   and Universal Decimal Classification
  Universal Decimal Classification
  The Universal Decimal Classification is a system of library classification developed by the Belgian bibliographers Paul Otlet and Henri La Fontaine at the end of the 19th century. It is based on the Dewey Decimal Classification, but uses auxiliary signs to indicate various special aspects of a...
  
   for books
• West American Digest System
  West American Digest System
  The West American Digest System is a system of identifying points of law from reported cases and organizing them by topic and key number. The system was developed by West Publishing to organize the entire body of American law...
  
   legal topic numbering scheme

Transportation

• Vehicle registration plate
  Vehicle registration plate
  A vehicle registration plate is a metal or plastic plate attached to a motor vehicle or trailer for official identification purposes. The registration identifier is a numeric or alphanumeric code that uniquely identifies the vehicle within the issuing region's database...
  
  s
• British Carriage and Wagon Numbering and Classification
  British carriage and wagon numbering and classification
  A number of different numbering and classification schemes have been used for carriages and wagons on Britain's railways, and this page explains the principal systems...
  
  
• British Rail locomotive and multiple unit numbering and classification
  British Rail locomotive and multiple unit numbering and classification
  A number of different numbering and classification schemes were used for locomotives and multiple units operated by British Railways , and this page explains the principal systems...
  
  
• UIC classification of goods wagons
  UIC classification of goods wagons
  This list contains the UIC classification of goods wagons and their meanings. The description is made up of a class letter and usually several code letters ....
  
  

Others/general

• API well numbers for numbering oil and gas
  Natural gas
  Natural gas is a naturally occurring gas mixture consisting primarily of methane, typically with 0–20% higher hydrocarbons . It is found associated with other hydrocarbon fuel, in coal beds, as methane clathrates, and is an important fuel source and a major feedstock for fertilizers.Most natural...
  
   wells
  Oil well
  An oil well is a general term for any boring through the earth's surface that is designed to find and acquire petroleum oil hydrocarbons. Usually some natural gas is produced along with the oil. A well that is designed to produce mainly or only gas may be termed a gas well.-History:The earliest...
  
   in the United States
  United States
  The United States of America is a federal constitutional republic comprising fifty states and a federal district...
  
  
• Bank card number
  Bank card number
  A bank card number is the primary account number found on credit cards and bank cards. It has a certain amount of internal structure and shares a common numbering scheme. Credit card numbers are a special case of ISO/IEC 7812 bank card numbers....
  
  
• International Statistical Classification of Diseases and Related Health Problems
  ICD
  The International Statistical Classification of Diseases and Related Health Problems is a medical classification that provides codes to classify diseases and a wide variety of signs, symptoms, abnormal findings, complaints, social circumstances, and external causes of injury or disease...
  
   for disease
  Disease
  A disease is an abnormal condition affecting the body of an organism. It is often construed to be a medical condition associated with specific symptoms and signs. It may be caused by external factors, such as infectious disease, or it may be caused by internal dysfunctions, such as autoimmune...
  
  s
• The MAC address
  MAC address
  A Media Access Control address is a unique identifier assigned to network interfaces for communications on the physical network segment. MAC addresses are used for numerous network technologies and most IEEE 802 network technologies, including Ethernet...
  
   allocation scheme for hardware addresses of certain networking products
• National Pokédex
• The NSAP allocation scheme
• Post office box
• Production code number
  Production code number
  A production code number, also known as the production code or episode code is an alphanumeric designation used to uniquely identify episodes within a television series...
  
  
• Stamp numbering system
  Stamp numbering system
  Philatelists' traditional method of identifying postage stamps uniquely has long been to number each country's stamps consecutively; Norway #1 is the 4-skilling blue stamp issued in 1855, and so forth...
  
  
• Use of ordinals by monarchs
  • Princes of Reuss
  • Popes
• Wikipedia markup syntax for numbered lists