Mlle. Mademoiselle.
MS., or Ms. Manuscript. MSS. Manuscripts.
N. B., Nota bene. Mark well, or take notice.
N. S. New Style (after 1752).
Ob., Obiit. He or she died.
O. S. Old Style (previous to 1752).
Ph. D., Philosophiæ Doctor. Doctor of Philosophy.
Pp. Pages.
P. P. C., Pour prendre congé. To take leave. This is not an abbreviation for the English words: Paid parting call.
Pro tem., Pro tempore. For the time being.