The meaning of the letters in the hotel schedule

Each hotel will have its own shift schedule. In order to facilitate shift scheduling and improve efficiency, the shifts will be simplified into letters to represent them. Under normal circumstances, the shifts of different departments, teams, and positions will be different. The ABCO here is not necessarily the same, but basically they still represent morning shift, normal shift, middle shift, evening shift, night shift, compensatory time off, etc. Rest and other shift conditions. According to my work experience, it may be roughly as follows: A-morning shift, B-middle shift, C-night shift, O-compensatory time off. Please refer to