Found:

Theta-role

SYNTAX: the semantic relationship of an argument with the predicate it is an argument of is expressed through the assignment of a role by the predicate to the argument, in conformity with the theta criterion. Different theta-roles have different labels, such as Agent and Theme. EXAMPLE: in Ken sent me the argument Ken is the Agent of the predicate sent me, and the argument me is the Theme of the predicate sent. Other theta-roles that have been distinguished are Goal, Source, Experiencer.