I was watching an episode of Expedition Unknown on my DVR last night. In the background behind the host, Josh Gates, is a paddle with the letters Delta Psi on it. In between the Greek letters are "JGT", which stands for "Josh Gates Tonight" - the name of the show they put on during the pandemic (since Josh couldn't travel the world).
I checked and it looks like Josh Gates went to Tufts University, but I couldn't find any mention of a fraternity affiliation. The only Delta Psi I know is St. Anthony's Hall. So this could possibly be an instance where the prop guy added "random" Greek letters for effect.