The number 00 is not permitted for use by players in the National Football League under strict uniform numbering regulations. The NFL enforces a standardized numbering system where specific position groups—such as quarterbacks, running backs, wide receivers, and linemen—must select numbers from designated numerical ranges. Because 00 does not fit into these strict positional categories and modern data tracking systems historically favored traditional single and double-digit integers, the number remains entirely restricted across professional football rosters.