Rule 8 – Section 3 – Article 2 – Opportunity to Score
A try is an opportunity for either team to score one or two points while the game clock is stopped after a touchdown. It is a special interval in the game which, for purposes of penalty enforcement only, includes both a down and the ‘‘ready’’ period that precedes it.
b. The try, which is a scrimmage down, begins when the ball is declared ready for play.