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Prefix code. A prefix code is a type of code system distinguished by its possession of the "prefix property", which requires that there is no whole code word in the system that is a prefix (initial segment) of any other code word in the system. It is trivially true for fixed-length codes, so only a point of consideration for variable-length codes .
Power of 10. Visualisation of powers of 10 from one to 1 trillion. A power of 10 is any of the integer powers of the number ten; in other words, ten multiplied by itself a certain number of times (when the power is a positive integer). By definition, the number one is a power (the zeroth power) of ten. The first few non-negative powers of ten are:
Worldwide distribution of country calling codes. Regions are coloured by first digit. Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.
In 2007, the length of an ISBN changed from 10 to 13 digits, and a new 3-digit prefix (978 or 979) was added in front of 10-digit ISBNs. [ 2] The following registration groups are compatible with or without a 978- prefix: 0–5. 600–639. 64–69. 7. 80–94. 950–989. 9900–9989.
An NSN on the tag of a pair of trousers. A National Stock Number, or National Stock Number (NSN) as it is known in the U.S., is a 13-digit numeric code used by the NATO military alliance, identifying all the 'standardized material items of supply' as they have been recognized by all member states of NATO.
The airline accounting code, or prefix code, is a 3-digit number, referenced by IATA and unique among all the airlines, used to identify the airline in various accounting activities such as ticketing. For instance, Lufthansa (LH/DLH) has been assigned 020 as accounting code, and all the flight tickets issued by that airline start with "020-".
Here are some examples of mobile phone numbers in Argentina: (11) 15 1234–5678 Buenos Aires. (380) 15 123–4567 La Rioja. (2966) 15 12-3456 Río Gallegos. The prefix 15 is not part of the number, although users sometimes give out their numbers with the prefix included.
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