FRI / SUN / MON
Well, yes, I know that you know that these are abbreviations for
Friday, Sunday, and Monday. But these are the only three
three-letter abbreviations to which you can simply add the letters
"D A Y" to name a day of the week. The others require additional letters:
- TUE + SDAY
- WED + NESDAY
- THU + RSDAY
- SAT + URDAY