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

• 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, 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 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

Other uses

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

See also

• Ø (disambiguation)
• Null symbol (disambiguation)
• 0 (disambiguation)
• Nil (disambiguation)
• Nul (disambiguation)

• All pages with titles beginning with Null
• All pages with titles containing Null