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I've seen that word ('OP') on "Math.SE" a couple of times and, I'm actually not sure about it's meaning. Is it a jargon or term for example? Could someone explain it simply, please?

Thanks.

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    $\begingroup$ BTW "dup" ("dupe"?) is duplicate post. $\endgroup$ – user2468 May 2 '12 at 15:20
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    $\begingroup$ :D That "dupe" sounds strange but, thanks for the information you have given. :) $\endgroup$ – Kerim Atasoy May 2 '12 at 15:45
  • $\begingroup$ WOW, "OP" is used incorrectly so many times. $\endgroup$ – user535339 Mar 4 '18 at 4:05
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OP = O​riginal P​ost(er)

It refers to either the original post (which may be the original question or the original answer on which a comment is placed) or the author of said post.

See also this Meta.SO thread.

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    $\begingroup$ I see. Thank you very much, Willie. $\endgroup$ – Kerim Atasoy May 2 '12 at 13:49
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    $\begingroup$ And another similar thread here: meta.math.stackexchange.com/questions/3012/… $\endgroup$ – Martin Sleziak May 2 '12 at 14:37
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    $\begingroup$ @Martin: ah thanks! I was looking for that post, but my search-fu wasn't good enough and I have the MSO one bookmarked. $\endgroup$ – Willie Wong May 2 '12 at 14:39

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