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Re:X to close by gnarbarian on Wednesday August 13, 2014 @04:06AM (#8171903)
A few counterpoints.

"X marks the spot"

Checking a box to indictate your selection on a form or ballot.

I can't think of any more off the top of my head.

Re:X to close by pjlegato on Wednesday August 13, 2014 @05:41PM (#8175147)
Checkmarks (positive, accepted item) are quite often opposed to X marks (negative, undesired item).