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Learn about the standard codes for the names of countries and their subdivisions, maintained by the International Organization for Standardization (ISO). Find the ISO 3166-1 alpha-2, alpha-3 and numeric codes, the ISO 3166-2 subdivision codes and the Internet country code top-level domains for each of the 249 countries.
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 about the Unicode blocks that encode characters for mathematical notation, such as ∙ (dot operator) in the Mathematical Operators block (U+2200–U+22FF). See the official code charts and examples of usage for each block.
The web page lists the International Olympic Committee (IOC) country codes for 206 current and past National Olympic Committees (NOCs). The code for Indonesia is INA, which was used from 1960 to 1968.
A code page is a character encoding that associates printable characters and control characters with unique numbers. Learn about the origin, usage, and variations of code pages, especially IBM's EBCDIC-based code pages and Microsoft's code page numbers.
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.
Propositional calculus, also called propositional logic, sentential calculus, or sentential logic, is a branch of logic that deals with propositions and their relations. It uses logical connectives to form compound propositions and has a formal language with truth tables and natural deduction.