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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.

closed as primarily opinion-based by tchrist, MetaEd, Matt E. Эллен, Kristina Lopez, TrevorD Aug 16 '13 at 14:24

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

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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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