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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.
Hexadecimal is a positional numeral system that uses sixteen symbols, usually "0"–"9" and "A"–"F", to represent numbers. It is widely used in computing and mathematics to represent binary-coded values or large decimal numbers.
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.
Alt code is a method of entering characters that do not have a dedicated key combination on the keyboard, using the Alt key and a numeric code. Learn about the history, usage and limitations of Alt code on Windows, MS-DOS, Unicode and other operating systems.
Learn how to specify web colors using hexadecimal format (hex triplet) or RGB values. A hex triplet is a six-digit number that represents the red, green, and blue components of a color, while RGB values are decimal numbers in the range 0 to 255.
A file signature, also known as a magic number or magic byte, is a data used to identify or verify the content of a file. This web page lists various file signatures and their hexadecimal, ISO 8859-1, and extension codes.
Learn about the Unicode block that contains various common symbols related to technical, programming, and academic fields. See the list of symbols, their names, hexadecimal and decimal codes, and pictures.
Aztec Code is a matrix code invented by Andrew Longacre, Jr. and Robert Hussey in 1995. It has a bull's-eye pattern at its centre and can use less space than other barcodes because it does not require a blank "quiet zone".