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Microsoft® Manual of Style, Fourth Edition by Microsoft Corporation

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K

K, K byte, Kbyte

Do not use as abbreviations for kilobyte. Use KB instead. Do not use K to refer to $1,000. It’s slang. See also KB.

KB

Abbreviation for kilobyte. Use the abbreviation only as a measurement with numerals. Do not use the abbreviation in text without a numeral. Insert a space between KB and the numeral, or hyphenate if the measure is used as an adjective. Spell out as kilobyte on first mention unless you are positive that your audience is familiar with the term. See also kilobyte.

Microsoft style

Download size: 512 KB

500-KB hard disk space

Kbit

Do not use as an abbreviation for kilobit. Always spell out.

KBps, Kbps

KBps is the abbreviation for kilobytes per second. Kbps is the abbreviation for kilobits per second. Use the abbreviations ...

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