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Kilo is a unit prefix, written with the symbol "k". It denotes a factor 1000 and can be used for all units. In everyday speech, you use the word 'kilo' as an abbreviation for kg, i.e. 1000 grammes. The so-called SI system was first introdced in 1960, but has roots back to the 1640s in France. It spread beyond France in connection with the French revolution in 1789.