Terran Imperial credit
In the mirror universe, the Terran Imperial credit was the monetary unit of the Terran Empire.

In an alternate timeline experienced by  via the Guardian of Forever, she and  wagered credits on the outcome of a knife fight between  and  in 2255. ()

In 2267, in an attempt to gain release from 's brig, the mirror universe  switched tactics from his earlier threats,  instead offering a bribe to prime universe Spock in "credits" and promising that the Vulcan could become a rich man. Mirror Kirk also mentioned the possibility of giving him a command of his own, if Spock so desired. ()

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Currency
Mirror universe