The digit 7 is not illegal or banned in basketball under standard FIBA regulations, where single-digit numbers ranging from zero to nine are fully permitted. However, traditional American high school and collegiate rulebooks governed by organizations like the National Federation of State High School Associations and the NCAA historically restricted digit choices to numbers utilizing digits zero through five to make it easier for referees to signal fouls using hand gestures. Consequently, players could not wear digits like 6, 7, 8, or 9 on their hands when communicating foul counts to the official scorer's table, though the NBA and WNBA allow all single and double digits up to 99.