| Subject | English | Japanese |
| comp., MS | null character | nulll 文字 (" 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. ") |
| phys. | null character | 空白キャラクタ (kūhaku-kyarakuta) |
| telegr. | null character | 空文字 |
| comp. | n null character | ヌル文字 |
| comp. | n null character string | ヌル文字列 |