Violence and disruption in the classroom is getting so bad, many teachers are leaving their jobs.
It's hoped the badge scheme will send a clear message to pupils that verbal and physical bullying is not on, says the union.
Children's charity Kidscape said pupils often hit out at teachers because they are angry about problems at home.
They reckon angry children don't get a chance to learn how to deal with their feelings properly.
But teachers say they need more support too and want to see more changes in the law to protect them.
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