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K-7
From WikiPedalia
One of my favorite French puns. The letter "K" is pronounced "kah", the number "7" is "sept" (the "p" is silent, like the "p" in swimming.) Thus, "K-7" is "kah-sept" or "cassette." I first encountered this in a French electronics catalogue, and it took me quite a while to figure it out. As far as I know, the French only use this abbreviation for tape cassettes, but I have fallen into the habit of using it as a shorthand for Freehub cassettes.
