Some people use triad more loosely. Usually people who don't distinguish sexually partners from non-sexual partners.
But generallyc if the two ends aren't sexually involved it would be described as a V. (which I am also in)
As to pansexual-you might ask Redpepper, as I think she identifies as pan. But personally, I have always found it too confusing and its irrelevant in my personal life as I don't identify that way and neither do my guys.