Null - in Computing

In 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
• 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), 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