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I was teaching one of the local highschool kids how to program in C and they asked "So why does everybody use i,j, and k for their indexes in loops?"

i stands for index. j and k because we can't use i anymore, and maybe because they are close together on the keyboard

I only use 'j' and 'k', not 'i ' -- the rarely-used letters are easier to search for.

ii is also good.