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A file signature, also known as a magic number or magic byte, is data used to identify or verify the content of a file. This web page lists the hexadecimal and ASCII values of various file signatures, along with their ISO 8859-1 encoding and description.
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.
John Titor was a pseudonym used by an internet forum poster who claimed to be a soldier from 2036 and a time traveler from 1975. He described his time machine, his mission to retrieve an IBM 5100 computer, and his predictions of a future civil war and nuclear war in the US.
Intel HEX is a text-based format that conveys binary data in hexadecimal form, used for programming microcontrollers and other devices. Learn about its history, structure, record types, checksum calculation and file extensions.
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.
Identity fraud is the use of another person's personal information without authorization to commit a crime or deceive. Learn about identity theft, synthetic identity fraud, and how identity fraud affects children and organizations.
Learn about different methods and tools to insert Unicode characters on a computer keyboard, such as extended keyboard mapping, screen selection, decimal input and emoji keyboard. Unicode input is the insertion of a specific Unicode character on a computer by a user; it is a common way to input characters not directly supported by a physical keyboard.
A magic number is a constant value in source code that has unexplained meaning or could be replaced with a named constant. Learn why using magic numbers is bad programming style and how to avoid it.