Geln was a male Ferengi in the 24th century, and the owner of Geln's Tongo Parlor, a gaming establishment in the capital city of Ferenginar. Following the reforms by Grand Nagus Zek and Rom, Geln's began admitting females into the parlor, and also into his exclusive high-stakes back room, much to the disapproval of his long-time customer, Nik. (DS9 - Worlds of Star Trek: Deep Space Nine novel: Ferenginar: Satisfaction is Not Guaranteed)