Definition: In the Bible, "input filter" refers to a key in a device used to read or write data into a specific place on a device, typically for communication purposes. This filter is essential to ensure that only valid data enters the system and does not interfere with other devices. The word 'filter' has biblical connotations, meaning a channel of access or passage through which information flows, and 'input' could refer to a source of input or a type of transmission line.