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Signing in means signing or writing the word "arrive" on the prescribed book to indicate that you have arrived. That is, recording oneself to show that one has attended or participated in an event. Mostly used for attending meetings or going to work.

Face scanning machine is the common name for facial biometric identification technology, which is the process of identity authentication through facial recognition technology. Face recognition is natural, and face communication is similar to the card swiping machines and fingerprint attendance machines used in the past.