This type of mark allows you to calculate the number of times any of the Attendance type of marks if repeated.
With the Attendance count you will be able to know how many times a student has been absent, late or has an unjustified absence, for instance.
To count the attendance, you only have to create a new column and select the Attendance count option that appears by default in the types of mark list.
In the Attendance count settings you will have to select the range of dates you want to count from, as well as the types of Attendance you want to take into account. Once you have selected an option, click on Back and Save so that the column with this type of mark is created.