Kov was a joined male Trill in the 23rd century. He was an agent of the Trill Symbiosis Commission who served as a go-between for the Commission and special investigator Verjyl Gard. (DS9 - The Lives of Dax short story: "Allegro Ouroboros in D Minor")
- The story never explicitly states Kov is joined, but given the sensitive nature of his job, it seems highly likely. As he's given only the single name, it's likely Kov is the name of the symbiont.