Optional parameter value is a random non-NULL value
You may either use {{GAOnHold}} by itself for the default message or you may add a standard message with an optional parameter value. Almost any value will trigger the standard message.
{{GAOnHold|Teachdaireachd gnàthaichte}} → GA on hold — Notes left on talk page.
Any of the following inline, comment-level templates can be converted into {{Resolved}}-style hatnotes by using {{Resbox}} to put a box around the icon and text.
{{enUici|Wikipedia:List of discussion templates|List of discussion templates]], a more linear table of essentially the same set of templates
Template:Resolved/See also, the smaller family of thread-level hatnote templates, similar to the above but with a box around them; any template above can be converted to one of those with {{Resbox}}