A postcriptive norm is a norm you 'ought not to do'. Something you shouldn't do.
Orianthi goes by Ori.
Avicii goes by Avicii.
Danalee goes by Dane.
Dhruva goes by Nenister.
Norm Charlton goes by The Sherrif.
Norm Taylor went by Lone One.
Norm Willey went by Wild Man.
Norm Van Brocklin went by The Dutchman.
Norm Van Lier went by Stormin' Norman.
Norine Marsh goes by Norm.
Norman Hayes goes by Norm.
Norm Cash is 6' 0".
Alex Cash goes by Alexander Cash.
Kimberly Cash goes by Kim Cash.
Alexis Cash goes by Lexy.
Norman Lieder goes by Namron, and Norm.