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Null

Null may refer to:

Science, technology, and mathematics

Astronomy

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

Computing

  • Null (SQL) (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 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 <code>/dev/null</code>
  • Null pointer or reference (sometimes written <code>NULL</code>, <code>nil</code>, or <code>None</code>), an object pointer (or reference) not currently set to point (or refer) to a valid object

Linguistics

  • Null (linguistics) (sometimes zero), a segment that is not pronounced or written:
  • Null morpheme (or zero morpheme), a morpheme that has no phonetic form.
  • Null coda, the coda of syllables ending in a vowel; especially in reference to languages that forbid codas.
  • Null onset (or empty onset, or zero onset), the onset of syllables beginning in a vowel; forbidden in some languages.
  • Null-onset letter (or zero consonant), a consonant letter that does not correspond to a consonant sound, but is required when a word or syllable starts with a vowel.
  • Null-subject language, a language whose grammar permits an independent clause to lack an explicit subject; such a clause is said to have a "null subject".
  • Null copula (or zero copula), a linguistic phenomenon whereby the subject is joined to the predicate without overt marking of this relationship.

Mathematics

Physics

Arts and media

People with the surname

  • Ashley Null (born 1960s), American Anglican theologian and bishop
  • Christopher Null (born 1971), American writer and film critic
  • Cecil Null (1927–2001), American songwriter
  • Eduard van der Nüll (1812–1868), Austrian architect
  • Gary Null (born 1945), American radio host and author of works about alternative medicine
  • Jack Null (1924–2003), American college basketball coach
  • Keith Null (born 1985), American football player
  • Luke Null (born 1990), American actor and comedian

See also