Is K capitalized in 5k?

Is K capitalized in 5k? These abbreviations are derived from the metric system: kilo- is abbreviated as k (lower case), meaning one thousand; mega- is abbreviated M (upper case), meaning one million (which contrasts with lower case m, meaning milli- or one one-thousandth).

These abbreviations are derived from the metric system: kilo- is abbreviated as k (lower case), meaning one thousand; mega- is abbreviated M (upper case), meaning one million (which contrasts with lower case m, meaning milli- or one one-thousandth).
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