Found:

AGR

SYNTAX: the person and number feature complex in finite INFL. Since Pollock (1989): a functional head containing agreement features and/or an agreement suffix which projects its own syntactic X-bar schema called Agreement Phrase (AGRP).

LIT.	Belletti, A. (1991) Chomsky, N. (1981) Ouhalla, J. (1990) Pollock, J.-Y. (1989)