A funerary triclinium, decorated in high haut relief, one sees two cousins holding a cup in front, a seated Palmerian, and centrally standing youth. From the Hypogeum of Malcou (?), Palmyra.

That is the text at the museum, I understand triclinium strictly is the name of the room where guests would recline on couches for dinner, what is obviously meant is: a group in such a room.