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The metric system uses the prefix kilo~ for a thousand.... kilometre = 1,000 metres.
The prefix is "kilo".
Metric system
When the metric system was created, the inventors used the Greek word for 1000, kilo, as the prefix meaning 1000. They used the Latin word for 1000, mill, as the prefix meaning 1/1000.
The metric system uses differing prefixes to show multiples of ten for base units. To indicate one thousand units, the prefix kilo- is used, as in kilometer, or kilowatt.