'log out' originates from the computing term 'log,' which meant 'record of events,' combined with 'out' to indicate exiting a system.

'log' was used in computing to refer to a record of events, and 'log out' became a common term as computer systems developed.

Initially, 'log' referred to a physical record, but in computing, it evolved to mean recording digital events, leading to 'log out' as exiting a system.