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The ICAO codes were originally based on a two-letter system and were identical to the airline codes used by IATA. After an airline joined IATA its existing ICAO two-letter code was taken over as IATA code. Because both organizations used the same code system, the current terms ICAO code and IATA code did not exist until the 1980s.
Numbering plan areas and area codes of Texas with numbering plan area 281/346/713/832 highlighted. Area codes 713, 281, 832, and 346 are telephone area codes in the North American Numbering Plan (NANP) forming an overlay complex for Houston, Texas and its environs. 713 is one of the original four area codes established for Texas in 1947.
The initial area codes were created in 1947 as routing codes for operator-assisted calls. Quebec and Ontario were the only provinces that received multiple area codes. Quebec was split between area codes 514 and 418. Area code 514 was originally assigned to the entire western half of Quebec from the Canada–US border to the Hudson Strait. The ...
The codes' procedure words, a type of voice procedure, are designed to convey complex information with a few words, when brevity is required but security is not; Ten-code, North American police brevity codes, including such notable ones as 10-4; Phillips Code; NOTAM Code; Wire signal, Morse Code abbreviation, also known as 92 Code. Appears in ...
DEFCON levels. The defense readiness condition (DEFCON) is an alert state used by the United States Armed Forces. [1] [2] For security reasons, the US military does not announce a DEFCON level to the public.
Area code 303 is the original area code, while area codes 720 and 983 were added (in 1998 and 2022 respectively) to form an overlay complex for the area, meaning that the same geographic service area is served by all area codes and that ten-digit dialing is required for all calls made within the service area.
Bird codes, also known as banding codes or alpha codes, are four-letter abbreviations for bird names used by bird banders, ornithologists, and birdwatchers in North and Central America. The codes are written in capital letters, and look like, e.g., MODO for mourning dove .
HS code 1006.30, for example, indicates Chapter 10 (Cereals), heading 10.06 (Rice), and subheading 1006.30 (Semi-milled or wholly milled rice, whether or not polished or glazed). In addition to the HS codes and commodity descriptions, each Section and Chapter of the HS is prefaced by Legal Notes, which are designed to clarify the proper ...
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