Null may refer to:

Science, technology, and mathematics

Astronomy

Nuller A nuller is an optical tool used to block a strong source so that fainter signals near that source can be observed. An example of a nuller is being employed on the Keck Interferometer. This causes the light from a star to destructively Interference ...

, an optical tool using interferometry to block certain sources of light

Computing

Null (SQL) In SQL, null or NULL is a special marker used to indicate that a data value does not exist in the database. Introduced by the creator of the Relational model, relational database model, E. F. Codd, SQL null serves to fulfill the requirement ...

(or NULL), a special marker and keyword in SQL indicating that a data value does not exist, is not known, or is missing. *

Null character The null character is a control character with the value zero. Many character sets include a code point for a null character including Unicode (Universal Coded Character Set), ASCII (ISO/IEC 646), Baudot, ITA2 codes, the C0 control code, and EB ...

, the zero-valued ASCII character, also designated by , often used as a terminator, separator or filler. This symbol has no visual representation. * Null device, a virtual file that discards data written to it, on Unix systems /dev/null *

Null pointer In computing, a null pointer (sometimes shortened to nullptr or null) or null reference is a value saved for indicating that the Pointer (computer programming), pointer or reference (computer science), reference does not refer to a valid Object (c ...

or reference (sometimes written NULL, nil, or None), an object pointer (or reference) not currently set to point (or refer) to a valid object

Mathematics

* Null (mathematics), a zero value in several branches of mathematics

Physics

Null (physics) In physics a null is a point in a Field (physics), field where the field quantity is zero as the result of two or more opposing quantities completely cancelling each other. The field may be Scalar field, scalar, Vector field, vector or Tensor fie ...

, a point in a field where the field quantity is zero * Null (radio), a concept in electromagnetism

Arts and media

*The Null Corporation, an imprint of the band

Nine Inch Nails Nine Inch Nails, commonly abbreviated as NIN (stylized as NIИ), is an American industrial rock band formed in Cleveland, Ohio in 1988. Its members are the singer-songwriter, multi-instrumentalist and producer Trent Reznor and his frequent col ...

* ''Null'' (Intronaut EP), 2006 * ''Null'' (Foetus EP), 1995 *Null, an identity of the character

Gray Fox The gray fox (''Urocyon cinereoargenteus''), or grey fox, is an omnivorous mammal of the family Canidae, widespread throughout North America and Central America. This species and its only congener (biology), congener, the diminutive island fox ...

in the ''Metal Gear Solid: Portable Ops'' video game *Null, a villain from '' Teenage Mutant Ninja Turtles Adventures'' * Null (''The Legend of Zelda''), the main antagonist of ''The Legend of Zelda: Echoes of Wisdom'' *Null, a mysterious character from Baldi's Basics.

People with the surname

* Ashley Null, American Anglican theologian * 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 of works about alternative medicine * Keith Null (born 1985), American football player * Luke Null (born 1990), American actor and comedian