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The Standard Industrial Classification (SIC) is a system for classifying industries by a four-digit code as a method of standardizing industry classification for statistical purposes across agencies. Established in the United States in 1937, it is used by government agencies to classify industry areas.
Zone 5 uses eight 2-digit codes (51–58) and two sets of 3-digit codes (50x, 59x) to serve South and Central America. Zone 6 uses seven 2-digit codes (60–66) and three sets of 3-digit codes (67x–69x) to serve Southeast Asia and Oceania. Zone 7 uses an integrated numbering plan; two digits (7x) determine the area served: Russia or Kazakhstan.
Level 3: 272 groups identified by three-digit numerical codes (01.1 to 99.0); Level 4: 615 classes identified by four-digit numerical codes (01.11 to 99.00). The first four digits of the code, which is the first four levels of the classification system, are the same in all European countries. National implementations may introduce additional ...
A complete 13-digit code has 5-digit number representing region, sector, city, and zone; 4-digit X between 2000 and 5999; 4-digit Y between 6000 and 9999. [23] Digits of 5-digit code may represent postal region, sector, branch, section, and block respectively.
In Latvia short codes also have no fixed length, starting from three digits up to five. All 4 digit short codes that start with "118" or 5 digit short codes that start with "1184" are designated to information service providers.
Aerodrome de Torreilles in France, for instance, has code LF6651. [4] In Antarctica many aerodromes have pseudo ICAO-codes with AT and two digits, while others have proper codes from countries performing air control such as NZ for New Zealand .
Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.