Question

what is meant by A.P

Answer 1

arithmetic progression

Answer 2

A. P is a versatile abbreviation. It serves in cardiology to abbreviate "angina pectoris"(A. P) and "arteial pressure "(A. P). In endocrinology, it stands for "anterior pituitary"(A. P) and in anatomy A.P means anteroposterior, i.e from front to back.
hope this helps...