In HTML in the td of a table you can break text by using between the words. This also works in the HeaderText of a TemplateItem but not the HeaderTex
For those of you trying to do this without disabling HtmlEncode it's pretty simple, if a little silly looking. Just use a real line break. Like so...
That will actually come out as multi-line when the HTML renders.
If there is a character combination that will signify this, I would love to know it.