Null may refer to:

## In computing[edit]

- 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[edit]

- 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
- Nulls, worm-like remains of defeated characters in the animated program ReBoot
- The Null Corporation, the current imprint for Nine Inch Nails

## In mathematics[edit]

- 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[edit]

- 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[edit]

- Christopher Null, American film critic
- Eduard van der N?ll, Austrian architect
- Gary Null, American radio host and author on alternative medicine
- Keith Null, American football player

## Other[edit]

- 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"

## See also[edit]

- 0 (disambiguation)
- Nil (disambiguation)
- Nul (disambiguation)

| This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.