The two sides of a coin are commonly referred to as the "heads" and "tails." The heads side typically features a portrait of a prominent figure, such as a president or a national symbol, while the tails side usually displays a different design or symbol associated with the country or its values. Coin flipping is often used as a simple method for decision-making, where each side represents a different choice. The terms "heads" and "tails" are universally recognized and are used in various games, gambling, and everyday situations, making them a familiar part of coin currency.