"Fly half" is a term used in rugby to describe the player who wears the number 10 jersey and acts as the key playmaker, facilitating both the team's offensive and defensive strategies. In American football, a similar role is played by the quarterback. However, there are several synonyms for "fly half" that are used in different parts of the world. In Australia, the position is often referred to as "five-eighth". In South Africa, the player may be called a "first five-eighth". In France, he may be referred to as the "demi d'ouverture" or simply "ouvreur". Regardless of the term used, the fly half/quarterback plays an essential role in any team's success.