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I would like to know if there is a common abbreviation for days of the week in a two letter form.

I mean: Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday; can be abbreviated as Su, Mo, Tu, We, Th, Fr, Sa? Is this the common form?

Note that I have also seen Sn for Sunday, and some times St for Saturday (but I think less frequently).

It will be used in a tabular data program to show information about free work days of employed and each column can't have enought space to include full week day name.

For "common form" I mean, what are the abbreviations that is more used in programs.

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Three-letter abbreviations are more common, but two-letter ones are also fully understandable.

In a tabular calendar, even one-letter abbreviations are acceptable, since the position is sufficient to disambiguate the S's and T's.

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    So Su, Mo, Tu, We, Th, Fr, Sa is a common form and can be used without problem? – PhoneixS Aug 16 '13 at 7:08
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    @PhoneixS: You haven't even said where you want to use the abbreviations, so it's hard for anyone to say definitively whether or not the two-letter forms could be used "without problem." – J.R. Aug 16 '13 at 8:03
  • Ouch! True, sorry for my omission @J.R. – PhoneixS Aug 18 '13 at 11:01
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    In the application you mention, two-letter abbreviations should be well-understood and work just fine. But really, this is more a question for the user than a question about English. – J.R. Aug 18 '13 at 11:32
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Another variation I have seen (and used) is (starting with Sunday): Su, M, Tu, W, Th, F, Sa

In other words, single letters for unambiguous days, two letters for the ambiguous ones.

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