alter ego

noun | \ ˈȯl-tər-ˈē-gō \ | al·ter ego

1. : second self; especially : a person or entity vicariously liable for another (as an agent) had the officer been the alter ego of the corporation —J. J. White and R. S. Summers — compare instrumentality : a person or entity vicariously liable for another (as an agent) had the officer been the alter ego of the corporation —J. J. White and R. S. Summers — compare instrumentality

   Note: The concept of a legal alter ego is used primarily to hold the controlling parties of a corporation personally liable instead of limiting liability to the corporate entity.