Skittle pin, also known as bowling pin, is an essential element in the game of bowling. However, there are several synonyms that are used for this term, such as tenpin, ninepin, keg, and even billy. While tenpin and ninepin are derived from the number of pins used in the game, keg and billy originated from the earlier days of bowling, where the pins were made of wood and resembled a barrel. In some regions, the term "duckpin" is used instead of "skittle pin," and refers to smaller, squatter pins used for a different type of bowling. Regardless of their names, these pins remain integral to the game and provide endless hours of entertainment for bowling enthusiasts.