In computing

• Null (SQL)
  Null (SQL)
  Null is a special marker used in Structured Query Language 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 fulfill the requirement that all true relational database management systems support...
  
  , a special marker and keyword in SQL
• Null character
  Null character
  The null character , abbreviated NUL, is a control character with the value zero.It is present in many character sets, including ISO/IEC 646 , the C0 control code, the Universal Character Set , and EBCDIC...
  
  , the zero-valued ASCII character, also designated by NUL, often used as a terminator, separator or filler
• Null device
  Null Device
  Null Device is an electronic pop band from Wisconsin, USA.-Band history:Null Device is an electronic band formed in 1995 by Eric Oehler, William Annis, and Tom Lawrence at the University of Wisconsin–Madison. After the amicable departures of Annis and Lawrence, Dr. Eric Goedken joined as a...
  
  , a special computer file that discards all data written to it
• Null modem
  Null modem
  Null modem is a communication method to connect two DTEs directly using an RS-232 serial cable. The name stems from the historical use of the RS-232 cable to connect two teleprinter devices to modems in order to communicate with one another; null modem communication was possible by instead using...
  
  , a specially wired serial communications cable
• Null object pattern
  Null Object pattern
  In object-oriented computer programming, a Null Object is an object with defined neutral behavior. The Null Object design pattern describes the uses of such objects and their behavior . It was first published in the Pattern Languages of Program Design book series.-Motivation:In most...
  
  , 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
  Null-terminated string
  In computer programming, a null-terminated string is a character string stored as an array containing the characters and terminated with a null character...
  
  , 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
  KK Null
  KK Null is a Japanese experimental multi-instrumentalist. He began as a guitarist, but soon added composer, singer, electronic musician and drummer to his list of talents, and also studied with the Butoh workshop....
  
  , 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
  John Whitbourn
  John Whitbourn is an author and tenth-generation inhabitant of southern England's Downs Country. He has produced a variety of novels and short stories focusing on alternative histories set in a 'Catholic' universe...
  
  
• Null, the Living Darkness
  Null, the Living Darkness
  Null, called also Null the Living Darkness, is a fictional character in the Marvel Universe.Null is a demon and enemy of the Defenders and Squadron Supreme.-Fictional character biography:...
  
  , a Marvel Comics character
• Nulls, worm-like remains of defeated characters in the animated program ReBoot
  ReBoot
  ReBoot is a Canadian CGI-animated action-adventure cartoon series that originally aired from 1994 to 2001. It was produced by Vancouver-based production company Mainframe Entertainment, Alliance Communications, BLT Productions and created by Gavin Blair, Ian Pearson, Phil Mitchell and John Grace,...
  
  

In mathematics

• Null (mathematics)
  Null (mathematics)
  In mathematics, the word null means of or related to having zero members in a set or a value of zero...
  
  , a zero value in several branches of mathematics
• Null set
  Null set
  In mathematics, a null set is a set that is negligible in some sense. For different applications, the meaning of "negligible" varies. In measure theory, any set of measure 0 is called a null set...
  
  , a set that is negligible in some sense
  • Also an older term for the empty set
    Empty set
    In mathematics, and more specifically set theory, the empty set is the unique set having no elements; its size or cardinality is zero. Some axiomatic set theories assure that the empty set exists by including an axiom of empty set; in other theories, its existence can be deduced...
    
    

In science

• Null allele
  Null allele
  A null allele is a mutant copy of a gene that completely lacks that gene's normal function. This can be the result of the complete absence of the gene product at the molecular level, or the expression of a non-functional gene product...
  
   (genetics)
• Null cipher
  Null cipher
  A null cipher is an ancient form of encryption where the plaintext is mixed with a large amount of non-cipher material. It would today be regarded as a simple form of steganography. Null ciphers can also be used to hide ciphertext, as part of a more complex system.In classical cryptography a null...
  
  , a ciphertext symbol
• Null hypothesis
  Null hypothesis
  The practice of science involves formulating and testing hypotheses, assertions that are capable of being proven false using a test of observed data. The null hypothesis typically corresponds to a general or default position...
  
  , a concept in statistical hypothesis testing
• Null morpheme
  Null morpheme
  In morpheme-based morphology, a null morpheme is a morpheme that is realized by a phonologically null affix . In simpler terms, a null morpheme is an "invisible" affix. It is also called a zero morpheme; the process of adding a null morpheme is called null affixation, null derivation or zero...
  
  , a concept in linguistics
• Null (radio)
  Null (radio)
  In radio electronics, a null is an area or vector in an antenna's radiation pattern where the signal cancels out almost entirely.This can be an advantage, as nulls in the horizontal plane can be used to protect other transmitters from interference. If not carefully planned however, nulls can...
  
  , a concept in electromagnetism
• Null result
  Null result
  In science, a null result is a result without the expected content: that is, the proposed result is absent. It is an experimental outcome which does not show an otherwise expected effect. This does not imply a result of zero or nothing, simply a result that does not support the hypothesis...
  
  , 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
  Christopher Null
  Christopher Null is a film critic, columnist and former blogger for Yahoo! Tech, editor of Drinkhacker.com, and is the founder and editor in chief of Filmcritic.com.-Publications:...
  
  , American film critic
• Eduard van der Nüll
  Eduard van der Nüll
  Eduard van der Nüll was an Austrian architect, who was one of the great masters in the historicist style of Vienna's Ringstrasse.-Life and work:...
  
  , Austrian architect
• Gary Null
  Gary Null
  Gary Michael Null is an American talk radio host and author on alternative and complementary medicine and nutrition. On his talk radio show and in his books and self-produced movies, Null has criticized the medical community, promoted a range of alternative cancer treatments and dietary...
  
  , American radio host and author on alternative medicine
• Keith Null
  Keith Null
  Keith Null is an American football quarterback who is currently a free agent. He was drafted by the St. Louis Rams in the 2009 NFL Draft...
  
  , American football
  American football
  American football is a sport played between two teams of eleven with the objective of scoring points by advancing the ball into the opposing team's end zone. Known in the United States simply as football, it may also be referred to informally as gridiron football. The ball can be advanced by...
  
   player
• KK Null
  KK Null
  KK Null is a Japanese experimental multi-instrumentalist. He began as a guitarist, but soon added composer, singer, electronic musician and drummer to his list of talents, and also studied with the Butoh workshop....
  
  , Japanese experimental multi-instrumentalist musician

Other

• Null and void, having no legal validity
• The Null Corporation
  The Null Corporation
  The Null Corporation is an independent record label which releases the work of Nine Inch Nails and How to Destroy Angels. The Nine Inch Nails albums, Ghosts I–IV and The Slip, have been released in physical formats under the Null Corporation imprint...
  
  , the current imprint for Nine Inch Nails
• Null-A, a term used in science fiction, referring to Korzybski's notation as an abbreviation for "non-Aristotelian"