Football refers to a number of team sports heads basketball that involve, to varying degrees, kicking a ball to score a goal. Unqualified, the word sports heads soccer is understood to refer to whichever form of football is the most popular in the regional context in which the word appears. Sports commonly called head soccer unblocked in certain places include: association football; gridiron football; Australian rules football; rugby football; and Gaelic big heads basketball. These different variations of football are known as big heads soccer codes.