Pre-nominal letters are a title which is placed before the name of a person as distinct from a post-nominal title which is placed after the name. Examples of pre-nominal titles, for instance professional titles include: Doctor, Captain, EUR ING (European Engineer), Ir. (ingenieur), Ts. (professional technologist), Ar. (architect), Sr. (surveyor), Br. (certified builder), Gs. (geologist), Mons. (monsignore), CA (Indian chartered accountant)[1] and Professor.
These distinctive titles replace the standard honorifics used in polite address, indicating gender and, for women, marital status; the common English forms are Mr., Ms., Mrs. and Miss. These honorifics are not normally considered as titles.