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ISO 4217 is a standard that defines alpha and numeric codes for currencies and funds. Learn about the history, types, and list of ISO 4217 codes for national and supranational currencies, precious metals, and other monetary units.
Learn about the different types and categories of top-level domains (TLDs) in the Domain Name System of the Internet. See the list of 1502 TLDs, including generic, country code, infrastructure, and test domains, with their names, entities, and notes.
Learn about the ISO 3166-1 standard that defines codes for the names of countries, dependent territories, and special areas of geographical interest. Find out the criteria, information, and disputes for the three sets of country codes: alpha-2, alpha-3, and numeric.
Learn how to use character entity references in XML and HTML documents, and see the list of predefined and custom entities for various scripts and symbols. Find out the differences between numeric and character entity references, and the formal public identifiers for HTML DTD entities subsets.
Medicare is a federal health insurance program for people age 65 or older and younger people with disabilities, started in 1965 under the Social Security Act. It is divided into four parts: A, B, C and D, covering hospital, outpatient, prescription and private plans services.
A comprehensive list of the two-letter codes used by civil aircraft around the world, organized by country or region. Learn the meaning and history of each prefix, and how to identify the origin of an aircraft by its registration number.
JFK is a major international airport serving New York City and its metropolitan area, in the United States. It is located in Queens, New York City, and covers 5,200 acres (2,104 ha).
DHCP stands for Dynamic Host Configuration Protocol, a network management protocol that automatically assigns IP addresses and other parameters to devices on IP networks. Learn about the history, operation, and methods of DHCP for IPv4 and IPv6 networks.