anomaly detection
The identification of rare items, events or observations which raise suspicions by differing significantly from the expected or majority of the data
en-US/əˈnɑməli dɪˈtɛkʃən/
en-GB/əˈnɒməˌlɪ dɪˈtɛkʃn/
The identification of rare items, events or observations which raise suspicions by differing significantly from the expected or majority of the data