To add the Troth One Name Study badge to your Troth profiles use the badge template:- {{One Name Study|name =Troth}}

If you would like to add the Troth one name study member badge to your own profile the code to use is {{Member|ONS|name=Troth}} This is only to be used for members of the one name study, not for profiles included in the name study which should use {{One Name Study|name =Troth}}