I had to look some of these up for a Slashdot.org poll, so I thought I’d share the results.
Galactic credits standard
The Galactic Credit Standard, simply called a credit or abbreviated to cred, colloquially referred to as Republic Dataries, and later known as the Imperial Credit, was the main currency in use in the galaxy since the time of the Galactic Republic.
Currency used in the book “Second Foundation” in the Foundation series by Isaac Asimov
The standard unit of currency in the Agatean Empire in Terry Pratchett’s Discworld. In its usual form as a pure gold coin, it can be divided into half-rhinu and quarter-rhinu pieces, for ease of making small purchases.
Flanian Pobble Beads
A currency from Douglas’ Adams “Hitch Hikers Guide To The Galaxy”. It is only exchangable for other Flanian Pobble Beads.
Fictional currency of Star Trek, particularly Ferengi’s.
From the BBC SciFi comedy “Red Dwarf”. The dollarpound is a fictional currency used in both the series and the novels.
The fictional unit of currency of the series Farscape.
The currency used in the cult classic film Spaceballs.