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You can basically use any letter for a constant. "c" is often used because it's the first letter of "constant"; the use of "k" probably arises either from the fact that it has the same sound, in English, as "k"; or from other languages where the word "constant" is written with a "k" (e.g., "Konstante" in German).

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Any letter of the alphabet can be used, but c and k are often used - possibly because of the phonetic start of the word "constant".

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8y ago
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Q: Why do we use k for constant of proportionality?
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