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Null may refer to: == Computing == *Null (SQL), a special marker and keyword in SQL *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 special computer file that discards all data written to it *Null modem, a specially wired serial communications cable *Null Object pattern, a software design pattern using an object with defined neutral behavior *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) *Null-terminated string, a character string of which the length is determined by the first null-character (in programming language C and related languages) *Nullable type, a feature of some statically-typed programming languages which allows a data type to be set to the special value NULL 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Null」の詳細全文を読む スポンサード リンク
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