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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 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 two-letter country codes defined by ISO 3166-1, used for various purposes such as domain names, postal codes, and international standards. See the full list of codes, their meanings, and exceptions in this Wikipedia article.
Learn about the history and current codes of the international vehicle registration code, also known as VRI code or Distinguishing sign of the State of registration. The code is used to indicate the country of origin of a vehicle in international traffic.
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.
Find the mobile prefixes for different countries and territories, including Afghanistan, Åland, Algeria, American Samoa, Andorra, Angola, Antigua and Barbuda, Argentina, Armenia, Aruba, Ascension Island, Australia, Austria, etc. The web page also shows the international calling codes, the size of NN (NSN), and the carriers for each prefix.
The Constitution of the United States was ratified by nine of the thirteen states on June 21, 1788, after being drafted by the Constitutional Convention in 1787. It established a federal presidential republic with a bicameral legislature, a judiciary, and a system of federalism.