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 /dev/null 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
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 phenomenon whereby the subject is joined to the predicate without overt marking of this relationship
Mathematics Null (mathematics), a zero value in several branches of mathematics
Physics Null (physics), 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 Null (Intronaut EP), 2006 Null (Foetus EP), 1995 Null, an identity of the character Gray 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 character from Baldi's Basics
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 ∅ (disambiguation) Ø (disambiguation) Null symbol (disambiguation) 0 (disambiguation) Nil (disambiguation) Nul (disambiguation) Nullity (disambiguation) Nullification (disambiguation) Nothing (disambiguation)