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 NUL, often used as a terminator, separator or filler.
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 NUL, often used as a terminator, separator or filler.
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