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| English | Spanish |
| null character | carácter nulo (" A character code with a null value; literally, a character meaning "nothing." Although it is real in the sense of being recognizable, occupying space internally in the computer, and being sent or received as a character, a NUL character displays nothing, takes no space on the screen or on paper, and causes no specific action when sent to a printer. In ASCII, NUL is represented by the character code 0. ") |
| null key | clave NULL (A null value that is encountered in a key column) |
| null modem | módem nulo (Special cabling that eliminates the modem's need for asynchronous communications between two computers over short distances. A null modem cable emulates modem communication) |
| null object | objeto null (An object with no members) |
| null reference | referencia nula (In C++, a reference that has not been assigned an object) |