It depends on what letters you're talking about. If they are an M.D. or D.O. (equivalent degrees), that means he or she is a Medicinae Doctor (Medical Doctor) (Latin for "teacher of medicine") or Doctor of Osteopathic Medicine, the specific medical degree the physician possesses. A dentist will probably have DDS, "Doctor of Dental Surgery".
Many physicians are affiliated with some group of specialists or other and will list those after their name also; for example FACS stands for Fellow of the American College of Surgeons.
A physician who specializes in disorders of the skin is known as a dermatologist.
A dermatologist.
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Dermatologist
The letters MASc will usually mean that the person has gained a Master of Applied Science degree.
Those letters identify the type of university law degree he has.
Professional corporation.
Registered Architect
N.kamalesh
Fellow of Institute of Directors
controlled delivery
binary-coded decimal