Zeni (Ƶ, occasionally spelled "Zenni" or "Zenie") is a type of currency in the Dragon Ball series. According to Akira Toriyama, one Zeni is equivalent to one Yen, which is the real-world Japanese currency.
Zeni are also featured in many Dragon Ball Z video games, such as Dragon Ball Z: Super Saiya Densetsu, Dragon Ball Z: Shin Butōden, the Legacy of Goku series, the Budokai series, the Budokai Tenkaichi series (called Z Points in Budokai Tenkaichi 3), Dragon Ball Z: Harukanaru Densetsu, Dragon Ball Z: Attack of the Saiyans, Dragon Ball: Revenge of King Piccolo and Dragon Ball Online. They can be found on the story mode of the game and winning a tournament in the World Tournament mode in order to buy techniques, items etc. in the game's shop (alternatively, Zeni can also be earned by finishing runner-up after losing in the final).
In the World Tounament in the video game Dragon Ball Z: Budokai, second place wins 5000 Zeni and first place wins 10000 Zeni.
The only other known currency in the series is the Gammets used on Imecka, but in an episode of Dragon Ball there are wanted posters of Launch, the Tori-Bot, and other characters with dollar signs ($) representing their awards suggesting dollars may also exist exclusive to the anime. Zeni is often the prize for winning in a world tournament.