Look up Null, null, a-null, or núll in Wiktionary, the free dictionary.
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 something has no value
Null character, the zero-valued ASCII character, also designated by NUL, 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
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