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If you've been linked to this, you probably made a language mistake and whoever sent this to you cared enough to point it out. The best thing to do is read the details and see where you went wrong.
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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