Squad number (association football)

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Squad numbers are used in association football to identify and distinguish players that are on the field. Numbers very soon became a way to also indicate position, with starting players being assigned numbers 1–11, although in the modern game they are often influenced by the players' favourite numbers and other less technical reasons, as well as using "surrogates" for a number that is already in use. However, numbers 1–11 are often still worn by players of the previously associated position.^[1]

As national leagues adopted squad numbers and game tactics evolved over the decades, numbering systems evolved separately in each football scene, and so different countries have different conventions. Still, there are some numbers that are universally agreed upon being used for a particular position, because they are quintessentially associated with that role.^[1]

For instance, "1" is frequently used by the starting goalkeeper, as the goalkeeper is the first player in a line-up.^[1] It is also the only position on the field that is required to be occupied. "9" is usually worn by strikers, also known as centre-forwards, who hold the most advanced offensive position on the pitch, and are often the highest scorers in the team.^[1] "10" is one of the most emblematic squad numbers in football,^[2] due to the sheer number of football legends that have worn the number 10 shirt; playmakers, second strikers, and attacking midfielders have worn this number.^[1]