Null may refer to:

Science, technology, and mathematics

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 database model, E. F. Codd, SQL null serves to fulfil the requirement that all ''true ...

(or NULL), a special marker and keyword in SQL indicating that something has no value *

Null character The null character (also null terminator) is a control character with the value zero. It is present in many character sets, including those defined by the Baudot and ITA2 codes, ISO/IEC 646 (or ASCII), the C0 control code, the Universal Coded Ch ...

, the zero-valued ASCII character, also designated by , often used as a terminator, separator or filler. This symbol has no visual representation * Null pointer 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 german: null meaning "zero", which is from la, nullus meaning "none") is often associated with the concept of zero or the concept of nothing. It is used in varying context from "having zero members in a set" ...

, a zero value in several branches of mathematics

Physics

Null (physics) In physics a null is a point in a 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, vector or tensor in nature. Common situations where nulls arise ...

, 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 radi ...

, a concept in electromagnetism

Arts and media

*The Null Corporation, an imprint of the band Nine Inch Nails * ''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, the diminutive island fox (''Urocyon littor ...

in the ''Metal Gear Solid: Portable Ops'' video game *Null, a villain from ''

Teenage Mutant Ninja Turtles Adventures ''Teenage Mutant Ninja Turtles Adventures'' is a comic book series published from August 1988 to October 1995 by Archie Comics, based on the Teenage Mutant Ninja Turtles characters created by Kevin Eastman and Peter Laird. It is mainly based on t ...

People with the surname

Christopher Null Christopher Null is an American writer, film critic, and columnist. 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 to 2012. In 2003, CNN cal ...

(born 1971), American writer and film critic * Eduard van der Nüll (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 on alternative medicine *

Keith Null Keith Aaron Null (born September 24, 1985) is a former American football quarterback. He was drafted by the St. Louis Rams in the 2009 NFL Draft. He played college football at West Texas A&M. Null was also a member of the Jacksonville Jaguars and ...