In which sport would you commonly encounter the term

Solution

The term "Birdie" is commonly used in golf. It refers to a score on a single golf hole that is one stroke under par. Par is the expected number of strokes that an expert golfer should require to complete a hole. If a golfer completes a hole in one stroke less than par, it is called a "Birdie." Similarly, if a golfer completes a hole in two strokes less than par, it's called an "Eagle," and if it's three strokes less, it's referred to as an "Albatross" or "Double Eagle."