Null (CloudMonk.io)

Null

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See also Null (SQL), Null reference, Null pointer, Null pointer exception

Null may refer to:

Science, technology, and mathematics

=Computing

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

* Null character, the zero-valued ASCII character, also designated by Error: File not found: mono|NUL, often used as a terminator, separator or filler. This symbol has no visual representation

*Null device, a special computer file, named /dev/null on Unix systems, that discards all data written to it

*Null modem, a specially wired serial communications cable

*Null pointer (sometimes written NULL, nil, or None), 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)

=Mathematics

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* Null (mathematics), a zero value in several branches of mathematics

* Null set, a set that is negligible in some sense

**Also an older term for the empty set

=Other uses in science and technology

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* wp>Null cipher, a ciphertext symbol

* wp>Null hypothesis, a concept in statistical hypothesis testing
* wp>Null result, the absence of a hypothesized effect in the outcome of a scientific experiment

Other uses

* wp>Null and void, having no legal validity