+Mr.+, Mister.
+Mrs.+, Mistress (pronounced Missis).
+MS.+, Manuscript.
+MSS.+, Manuscripts.
+Mt.+, Mountain.
+N.+, North.
+N. A.+, North America.
+Nath.+, Nathaniel.
+N. B.+ (_nota bene_), Mark well.
+N. C.+, North Carolina.
+N. Dak.+, North Dakota.
+N. E.+, New England.
+N. E.+, Northeast.
+Nebr.+ or +Neb.+, Nebraska.
+Neh.+, Nehemiah.
+Nev.+, Nevada.
+N. H.+, New Hampshire.
+N. J.+, New Jersey.
+N. Mex.+ or +N. M.+, New Mexico.
+N. N. E.+, North-northeast.
+N. N. W.+, North-northwest.
+N. O.+, New Orleans.
+No.+ (_numero_), Number,
+Nov.+, November.
+N. W.+, Northwest
+N. Y.+, New York.
+Obad.+, Obadiah.
+Oct.+, October.
+Ohio+ or +O.+, Ohio.
+Oreg.+ or +Or.+, Oregon.