This article describes a concept which is mentioned in J.R.R. Tolkien's works, but was never given a definite name.
Before the Company of the Ring left Lothlórien, each of its members was presented with a gift by Galadriel. Boromir was given a belt of gold which he carried in the journey until the Breaking of the Fellowship.
Later on, Faramir one night saw the boat by Anduin and Boromir lay there dead, and the belt was the only thing he did not recognize. Frodo said to Faramir that the belt was given to him in Lórien, and thus positively identified the dead man as Boromir.