What is a11 football?
A-11 Football is an offensive system used in some levels
American football in which a team's offensive players are deemed
eligible to catch a forward pass - as determined by the formation
they're aligned in, and not according to their jersey number and
formation - as is the case in basic American football.
A-11 Football allows all of the team's offensive players to be
interchangeable in their sets because they are not restricted by
jersey numbers, like they are in basic football.
A-11 Football allows for 16,632 possible post-snap scenarios of
which player can receive the snap and advance with the football
because any player can align in any spot within any formation -
thereby making A-11 players interchangeable.
In basic American football using a five fixed offensive linemen
set, there are only 36 possibilities of which player can receive
the snap and advance with the ball because the offensive linemen
are not interchangeable within the formation with other offensive
players - the jersey-numbering requirement does not allow it.