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Learn the meanings and origins of various terms used by the United States Marine Corps, such as SNM, SNA, SNAFU, and more. This list covers words and phrases related to military slang, naval terminology, units, gear, and history.
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.
This web page shows the current and past codes used by the International Olympic Committee (IOC) for each National Olympic Committee (NOC). The code for Ivory Coast is CIV, which was also used for Costa de Marfil in 1964 and 1968.
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.
A comprehensive overview of the Unicode characters, covering 161 modern and historical scripts, as well as multiple symbol sets. Learn how to reference Unicode characters using numeric or entity codes, and see the control codes and special characters.
ISO 639 is a standardized nomenclature used to classify languages. This table lists all two-letter codes (set 1) and some of the three-letter codes (sets 2–5) for each language, along with their names, types and scopes.
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.
Reflected binary code, also known as Gray code, is an ordering of the binary numeral system such that two successive values differ in only one bit. Learn the history, function, and visualization of Gray code from this Wikipedia article.