days of the week printable free

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, ... Gone are the days when a school or institution could count on being able to offer a standard curriculum and traditional programs to a steady stream of students and their parents. Gone too are the days when communication was top-down Gone are the days of local entertainers coming to play or perform free. Words exist to label periods of time - like week which represents 7 days and fortnight which is used for a 14-day period. Are there other such words used for certain numbers of consecutive days?