The symbol for the Altairian dollar from the game

The Altairian dollar is the principal medium of exchange throughout the Milky Way galaxy, partly due to the general incompatibility (and/or illusory nature) of most other forms of currency. According to The Hitchhiker's Guide to the Galaxy, a competent hitchhiker should be able to see the galaxy on less than thirty Altairian dollars a day, although costs around the Guide's headquarters make this, ironically, almost impossible.

It is based - or at least originated - on the planet Altair.

Appearances

It is mentioned several times in The Hitchhiker's Guide to the Galaxy series by Douglas Adams, such:

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