Kilogram
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If you mean: kk-5 then it can be k^2-5 But if you mean: k+k-5 then it can be 2k-5
K is short for kilo, which means thousand, 5K is 5000.
88 Keys on a piano keyboard.
in science terms, it means ==absolute==
If you mean in the group {1, -1, i, -i, j, -j, k, -k}, the identity element is 1.