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this was the first part of North America to have its code changed three times: from 213 to 714 1951: to 619 in 1982, and to 760 in 1997. was to have originally split off the portion of 760 serving San Diego County to a new 442 area code in late 2008/early 2009; that plan was cancelled. 2009: overlaid by 442. 761.
A country code top-level domain (ccTLD) is an Internet top-level domain generally used or reserved for a country, sovereign state, or dependent territory identified with a country code. All ASCII ccTLD identifiers are two letters long, and all two-letter top-level domains are ccTLDs.
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 ...
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.
In the United States, a Social Security number ( SSN) is a nine-digit number issued to U.S. citizens, permanent residents, and temporary (working) residents under section 205 (c) (2) of the Social Security Act, codified as 42 U.S.C. § 405 (c) (2). The number is issued to an individual by the Social Security Administration, an independent ...
Service number prefix and suffix codes were one and two letter designators written before or after a service number; a service member could only have one code at any given time. The purpose of these codes was to provide additional information regarding a military service member with the very first prefix codes created by the Army in 1920 and ...
Telephone prefix. A telephone prefix is the first set of digits after the country, and area codes of a telephone number. In the North American Numbering Plan countries (country code 1), it is the first three digits of a seven-digit local phone number, the second three digits of the 3-3-4 scheme. In other countries, both the prefix and the ...
When three-digit codes share a common leading pair, the shared prefix is marked by an arrow, (↙ ) pointing down and left to the three-digit codes. Unassigned codes are denoted by a dash (—). Countries are identified by ISO 3166-1 alpha-2 country codes; codes for non-geographic services are denoted by two asterisks (**).