The Eysenck Personality Inventory (EPI) is a widely used personality test that measures personality traits based on the theories of psychologist Hans Eysenck. However, there are various synonyms for EPI that are used interchangeably, such as the Eysenck Personality Questionnaire (EPQ) and the Eysenck Personality Profile (EPP). Another synonym for EPI is the Personality Inventory for Children (PIC), which is a version of the test designed for children aged 6 to 16 years old. Additionally, there are different versions of the EPI, such as the Eysenck Personality Inventory-Revised (EPI-R) and the Eysenck Personality Inventory-3 (EPI-3). Regardless of the synonym or version used, the Eysenck Personality Inventory remains a popular and reliable tool for assessing personality traits.