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I think it means that the HN software auto-removes exclamation marks from titles, and in this case the original title began "No WIMPS!". (I don't know that the

by gjm11 4y ago

I think it means that the HN software auto-removes exclamation marks from titles, and in this case the original title began "No WIMPS!". (I don't know that the HN software does this. Maybe the submitter made a typo.)