A display of information from an electronic device or instrument, showing measurements or data in a readable format.
Modern English compound from 'read' + 'out', coined in the mid-1900s with the rise of electronic instruments and computers. It describes the output of digital or electronic displays.
The term 'readout' became essential in the Space Race—astronauts depended on readouts from dozens of instruments, and mission control in Houston watched the same numbers on their screens, creating a shared language of data. It's why we still call dashboard information 'readouts' today.
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