A "birdie" is a term used in golf to describe a score that is one stroke under par on a particular hole. For example, if a hole has a par of 4, completing it in 3 strokes would earn a player a birdie. Achieving a birdie is considered a good accomplishment and reflects a player's skill and strategy. In addition to golf, the term "birdie" is also used in badminton to refer to the shuttlecock, which is the object players hit back and forth during a game. The shuttlecock is designed to fly in a specific way, making it essential for gameplay in badminton.