Null

Null may refer to:

Science, technology, and mathematics

Computing

  • Null (SQL) (or NULL), a special marker and keyword in SQL indicating that something has no value
  • Null character, the zero-valued ASCII character, also designated by NUL, often used as a terminator, separator or filler. This symbol has no visual representation
  • Null device, a special computer file, named /dev/null on Unix systems, that discards all data written to it
  • Null modem, a specially wired serial communications cable
  • Null pointer (sometimes written NULL, nil, or None), used in computer programming for an uninitialized, undefined, empty, or meaningless value
  • Null string, the unique string of length zero (in computer science and formal language theory)

Mathematics

Physics

Other uses in science and technology

Arts and media

Music

Other media

People with the surname

Other uses

  • Null and void, having no legal validity
  • Null-A, a term used in science fiction, referring to Korzybski's notation as an abbreviation for "non-Aristotelian" logic
  • Stunde Null, a term used in Germany to mark the end of the Second World War

See also

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