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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.
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.
Learn about the port numbers used by protocols for network applications, such as well-known ports, registered ports, and dynamic ports. See the table legend, the table cells, and the references and notes for more details.
Learn about the standard for in-band signaling to control cursor location, color, font styling, and other options on video text terminals and terminal emulators. Find out the history, platform support, and related standards of ANSI escape sequences.
Anonymous is a decentralized activist and hacktivist collective and movement that originated on the imageboard 4chan in 2003. The group is known for its cyberattacks against governments, corporations, and the Church of Scientology, and for its use of Guy Fawkes masks and the tagline "We are Anonymous. We are Legion."
A computer program is a sequence or set of instructions in a programming language for a computer to execute. Learn about the history, types, and examples of computer programs from this encyclopedia article.
Learn about the equalities that involve trigonometric functions and are true for every value of the variables. Find the Pythagorean, reflection, shift, periodicity, angle sum and difference, and Ptolemy identities with examples and proofs.
Learn about the two-letter country codes defined by ISO 3166-1, which are used for various purposes such as domain names, postal codes, and international standards. See the full list of codes, their meanings, and exceptions for GB (United Kingdom) and other regions.