The term 'Calendar Col.' is a reference to the days of the week, with each letter representing the first three letters of the day. The solutions for the crossword are SAT (Saturday), THUR (Thursday), TUE (Tuesday), FRI (Friday), MON (Monday), THU (Thursday), and TUES (Tuesday). This term is used to refer to the days of the week in order to help people organize their schedules and plan out their weeks.