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Either the maximum lifespan of a mobile phone battery when used for calling continuously, or the number of minutes included in your monthly fee to your mobile service provider. In any event, it's rarely enough!

Jargon Buster

The result of a mathematical calculation made using a file. The checksum can be used to verify that a file's contents have not been tampered with. Much used with open source software as one of the checks that software has not been tampered with.