orgs WHO and NOW: Abbr. Sch. yearbook section A.A. and A.A.A., for two Mensa and others: Abbr. Societies: Abbr. A.A. and A.A.A. 56-Down and others: Abbr. A.A.A. and B.B.B. Corps.; assns. O.A.S. and NATO Special-interest grps. Subjects of many H.S. yearbook photos E-mail address endings Assns. Yearbook sect. Grps. P.T.A. and N.E.A., for two Some Web site owners: Abbr. N.A.A.C.P. and others A.A.A. and B.B.B., e.g.