Birthday Figure is a term used to describe the traditional decorations used to celebrate a birthday. The most common figure is an AGE, usually represented by three letters, such as '7th' or '10th'. Another popular figure is LEO, which is also represented by three letters and is often used to represent the zodiac sign of the person whose birthday it is. Finally, CAKE is a four letter figure that is used to represent the CAKE that is typically served at a birthday celebration.