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Question 117292 has just been closed. I don't think this closure is entirely inappropriate but it clearly needs to be discussed.
As I remarked in a late comment, what triggered this question was a piece by David Mumford (in "The Best Writing on Mathematics: 2012"), in which he says: "I have no idea why, but when you have any set of things that [...], mathematicians call this set a ring." I looked it up in Wikipedia and did not find that explanation truly explanatory. I am sorry to cause this bit of trouble, but it has evoked an erudite answer by quid, for which I am grateful.
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