The gold and black team ring worn by Magnum, T.C. and Rick is a common memorabilia of the Vietnam War, symbolizing the close camaraderie and friendship between the three friends.

This ring is not an official sign or emblem of war, nor is it used officially in the U.S. Navy or U.S. Marine.

The dominant motif of the ring is the "Double Cross", the Cross of Lorraine. This is primarily seen as a French symbol of revolution resistance. But it is also used for many other symbolic purposes.

Originally, this symbol was used by the Knights Templar in the Middle Ages. Later it became the symbol of Joan of Arc in the 15^th century. The pound was later used by the U.S. Army in the First and Second World War.

The background of the ring was never fully explained on the show. You only see that all persons who were in the Vietnam War have this ring. Furthermore, the viewer can see this ring in many flashbacks from the Vietnam War.

You may find all episodes of Magnum P.I. here.