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I see "UPD" all over Stack Overflow and other Stack Exchange site and nowhere do I see it defined. Is it short for "update"?

An example:

UPD: problems with UTF-8 encoding in PHP

to be found at Some answers don't allow comments. Why?

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Context is needed. UPD could be a short for update or could be a mistype of UDP. Both of those cases seem relatively common. –  ho1 Dec 17 '10 at 21:40
    
@ho1: Added link to an example. –  Richard Cook Dec 17 '10 at 21:41

1 Answer 1

up vote 4 down vote accepted

That means "update." If you look at the revision history for the question you linked to you can see what was added.

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Thanks for the explanation. –  Richard Cook Dec 17 '10 at 21:45
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I've personally never seen that except in the linked question (people normally say Edit:), but that does seem to be what was intended –  Michael Mrozek Dec 17 '10 at 21:49
    
@Michael: I usually write out "Update:" myself, but I think you're right, "Edit:" is probably a lot more common. Without the link in the question, I thought "UPD" was a little ambiguous. –  Bill the Lizard Dec 17 '10 at 21:52
    
I found it all over the "cstheory" SE site and in a few place on meta SO. –  Richard Cook Dec 17 '10 at 21:53
    
@Michael: If you google site:stackoverflow.com upd you'll find a few instances where people write upd to mean update on the first pages of results. –  ho1 Dec 17 '10 at 22:15

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