Capt. is the abbreviation for captain
Dr.
In Doctor Who, Captain Jack's full name is Captain Jack Harkness.
Ph.D.
Doctor of Philosophy
M.D. (Hom.)
A Doctor of Divinity is abbreviated D.D. or DD after your name Example: Rev. Johnson Smith, D.D.
The abbreviation for juris doctor is JD.
the abbreviation is D.H.L.
Doctor of Osteopathic Medicine is abbreviated D.O.
what is a doctor captain?
Doctor is abbreviated to Dr. when used as a title in conjunction with the person's name, but not when addressing the person by title only or when using doctor merely as a noun, not a title. For example: * Dr. Smith * Dr. and Mrs. John Smith * How are you, Doctor? * Margaret is a doctor too.