Mazumas were a form of currency.
Mazumas could be found in the form of coins available in denominations including one and twenty (AUDIO: The Maltese Penguin) as well as banknotes called "Universal Credits." (COMIC: The Shape Shifter)
The Sixth Doctor and Frobisher stole 250,000 mazumas from Intra-Venus, Inc. (COMIC: The Shape Shifter) They gave them to Ivan Asimoff for the Zyglot trust. (COMIC: Polly the Glot) Hob's Death's Head Interactive Archive incorrectly reported this as having been 750,000 mazumas. (COMIC: The Incomplete Death's Head)
Groblux embezzled 715 million mazumas from The Kandaflax Charity. Majenta Pryce blackmailed Groblux into selling his and the rest of the major shareholders of Intra-Venus' shares to her for twelve mazumas, which was .000001% of their current value, in exchange for throwing the evidence of their misgivings away, which she later amended to ten, and then to five mazumas. (COMIC: The Stockbridge Showdown)