The IHF defines 18 hand signals for quick visual communication with players and officials. The signal for warning is accompanied by a yellow card.Official rules, hand signal 16:2 A disqualification for the game is indicated by a red card,Official rules 16:7 followed by a blue card if the disqualification will be accompanied by a report.Official rules 16:8 The referees also use whistle blows to indicate infractions or to restart the play.
The IHF defines 18 hand signals for quick visual communication with players and officials. The signal for warning is accompanied by a yellow card.Official rules, hand signal 16:2 A disqualifica.tion for the game is indicated by a red card,Official rules 16:7 followed by a blue card if the disqualification will be accompanied by a report.Official rules 16:8 The referees also use whistle blows to indicate infractions or to restart the play.