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Misspelling "kHz"

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The error is not so much misspelling as miscapitalizing. The abbreviation of the unit "kilohertz" meaning "thousands of cycles per second" is properly a lowercase "k", a capital "H", and a lowercase "z".

A lowercase "k" is the symbol for the prefix "kilo-" meaning 1000 in the metric system. "Hz" is the symbol for "hertz", named after the German physicist Heinrich Hertz. Because the unit is named after a person, the unit has a first capital letter while the name is not capitalized.

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