The silver tubes.
Pol (ポール, Pōru) is used by Freeza's Army in the 7th Universe. While the value and general usage of the currency is unknown, it clearly holds some value, at least within the army, as Cheelai and Lemo were excited to receive a large amount of it. They appear as silver tubes, and the only known instance of them being used was when Freeza had Beriblu pay Cheelai and Lemo reward money for finding Paragus and Broly.[1]
The Heeter family, as an extension of Freeza's Army, also use this currency.[2]