A tri-esta was a type of Ferengi coin. Miles O'Brien used one to practice a magic trick in preparation for Molly O'Brien's birthday party in 2369. (DS9 novel: The Siege)

Types of currency
materials	acta crystal • gold • latinum • ludugial gold • silver
units	bilbok • cent • credit • darsek • dejebbit • dirak • dollar • drokna • ducat • galorine credit slip • ilec • kern • klon peag • laertian dinar • lek • lita • notch-rock • prime transfer authority • quatloo • sakto • sous • szeket • t'chak • talon • tri-esta