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 In some operating systems, the null device is a device file that discards all data written to it but reports that the write operation succeeded. This device is called /dev/null on Unix and Unix-like systems, NUL: (see TOPS-20) or NUL on CP/M a ...

, 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) In mathematics, the word null (from meaning "zero", which is from meaning "none") is often associated with the concept of zero, or with the concept of nothing. It is used in varying contexts from "having zero members in a set" (e.g., null set ...

, 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) In radio electronics, a null is a direction in an antenna's radiation pattern where the antenna radiates almost no radio waves, so the far field signal strength is a local minimum. Nulls occur because different parts of an antenna radiate 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 ''Teenage Mutant Ninja Turtles Adventures'' is an American comic book series that was published from August 1988 to October 1995 by Archie Comics. The series, which was aimed at a younger audience than other ''Teenage Mutant Ninja Turtles'' comic ...

'' * 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 John Ashley Null (born 1960 or 1961) is an American theologian and Anglican bishop. As an academic, he is best known for his research on the theology of Thomas Cranmer, particularly Cranmer's doctrines of repentance and scripture, and his influen ...

, American Anglican theologian *

Christopher Null Christopher Null (born September 7, 1971) is an American writer, journalist and entrepreneur. A former blogger for Yahoo! Tech, he was the editor of Drinkhacker.com, and the founder and editor-in-chief of Filmcritic.com, which operated from 1995 ...

(born 1971), American writer and film critic *

Eduard van der Nüll Eduard van der Nüll (9 January 1812 (baptized) – 3 April 1868) was an Austrian architect, who was one of the great masters in the historicist style of Vienna's Ringstrasse. ''Architectural Theory: An Anthology from Vitruvius to 1870'', ...

(1812–1868), Austrian architect *

Gary Null Gary Michael Null (born January 6, 1945) is an American talk radio host and author who advocates pseudoscientific alternative medicine and produces a line of questionable dietary supplements. Null is hostile to evidence-based medicine and has ...

(born 1945), American radio host and author of works about alternative medicine *

Keith Null Keith Aaron Null (born September 24, 1985) is an American former professional football player who was a quarterback in the National Football League (NFL). He played college football for the West Texas A&M Buffaloes and was selected by the St. ...

(born 1985), American football player *

Luke Null Lucas Elliot Null (born July 7, 1990) is an American actor and comedian. He is best known as a cast member on the NBC sketch comedy series ''Saturday Night Live ''Saturday Night Live'' (''SNL'') is an American Late night television in the U ...

(born 1990), American actor and comedian