The correct answer is "Non-State Actor".
Non-State Actor are considered to be a single person or a group which are involved in political influence, but are not related to any country or nation especially any government body.
Terrorism is described as the utilization of purposefully unpredictable savagery as a way to make dread among masses of individuals; or dread to accomplish a budgetary, political, religious or ideological point. It is utilized as a part of this respect fundamentally to allude to savagery against peacetime targets or in war against non-soldiers.