Null

Null may refer to:

In computing

• Null (SQL), a special marker and keyword in SQL
• Null character, the zero-valued ASCII character, also designated by NUL, often used as a terminator, separator or filler
• Null device, a special computer file that discards all data written to it
• Null modem, a specially wired serial communications cable
• Null object pattern, a software design pattern using an object with defined neutral behavior
• Null pointer (sometimes written NULL), 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)
• Null-terminated string, a character string of which the length is determined by the first null-character (in programming language C and related languages)
• Nullable type, a feature of some statically-typed programming languages which allows a data type to be set to the special value NULL

In art

• KK Null, a Japanese musician
• 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 villian from Teenage Mutant Ninja Turtles Adventures
• Nulls, worm-like remains of defeated characters in the animated program ReBoot
• The Null Corporation, the current imprint for Nine Inch Nails

In 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

In science

• Null allele (genetics)
• Null cipher, a ciphertext symbol
• Null hypothesis, a concept in statistical hypothesis testing
• Null morpheme, a concept in linguistics
• Null (radio), a concept in electromagnetism
• Null result, the absence of a hypothesized effect in the outcome of a scientific experiment
• Null vectors or curves in the causal structure of a Lorentzian manifold such as a Minkowski space-time

People

• Christopher Null, American film critic
• Eduard van der Nüll, Austrian architect
• Gary Null, American radio host and author on alternative medicine
• Keith Null, American football player

Other

• 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"

See also

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