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  • A unit of magical energy, as featured in the Discworld novels by Terry Pratchett.

    Wikipedia says this: "The Thaum is a measuring unit used in quantifying magic on the disk. It equals the amount of mystical energy required to conjure up one small white pigeon, or three normal-sized billiard balls. Several SI-modifiers have been applied to it (e.g. millithaum, kilothaum) in the books. Magic can be measured with a thaumometer, which looks like a black cube with a dial on one side."

    October 10, 2008