What do you call 3 strokes under par in golf?

Answer 1

Either an Albatross, or a double eagle. Double eagle is mainly used in the US.

Answer 2

Called an eagle. Usually on a par 5, but can be made on a par 4. If one is made on a par 3 it will usually be called an ace or a hole in one, rather than an eagle.

Answer 3

An albatross or a double eagle. Double eagle is mainly used in the US.