Null

Encyclopedia

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

  • Null (mathematics), a zero value in several branches of mathematics
  • Null set, a set that is negligible in some sense
    • Also an older term for the empty set

Physics

  • Null (physics), a point in a field where the field quantity is zero
  • Null (radio), a concept in electromagnetism
  • Null vectors or curves in the causal structure of a Lorentzian manifold such as a Minkowski space-time

Other uses in science and technology

  • Null allele, in genetics
  • Null cipher, a ciphertext symbol
  • Null hypothesis, a concept in statistical hypothesis testing
  • Null morpheme, a concept in linguistics
  • Null result, the absence of a hypothesized effect in the outcome of a scientific experiment

Arts and media

Music

  • KK Null (born 1961), Japanese musician
  • The Null Corporation, an imprint of the band Nine Inch Nails
  • Null (Intronaut EP), 2006
  • Null (Foetus EP), 1995

Other media

  • Null, a slur used in Infinity Train to refer to denizens and other non-humans such as MT (Mirror Tulip) / Lake
  • Null, an identity of the character Gray Fox in the Metal Gear Solid: Portable Ops video game
  • Null, man-eating sentients in the Downs-Lord Triptich books by John Whitbourn
  • Null, the Living Darkness, a Marvel Comics character
  • Null, a villain from Teenage Mutant Ninja Turtles Adventures
  • Nulls, worm-like remains of defeated characters in the animated program ReBoot
  • Type: Null, a Gen VII Pokémon species introduced in Pokémon Sun and Moon

People with the surname

  • Christopher Null (born 1971), American writer and film critic
  • Eduard van der Nüll (1812–1868), Austrian architect
  • Gary Null (born 1945), American radio host and author on alternative medicine
  • Keith Null (born 1985), American football player
  • KK Null (born 1961), Japanese musician
  • Luke Null (born 1990), American actor and comedian

Other uses

  • Null and void, having no legal validity
  • Null-A, a term used in science fiction, referring to Korzybski’s notation {\displaystyle {\overline {A}}} as an abbreviation for “non-Aristotelian” logic
  • Stunde Null, a term used in Germany to mark the end of the Second World War