Similar to the sorts of to do list task key in many bullet journals, the Analog system has "task signals" :
- black filled circle means "complete task"
- half filled circle means task is in progress
- a right arrow in the circle means the task was delegated
- a cross in the circle means that the task is an appointment, potentially with the appointment time added to the to do item
The system suggests that you can "create your own" task signals, though in true minimalist fashion, it doesn't give other suggestions. Presumably one could do other pattern fills of the circle or symbols within it to mean other things (example: bullet journal key symbols).
Interestingly, the to do circles start out not blank, but with a single thin line splitting the circle in half vertically. This is apparently a design choice, perhaps to make it easier to fill in half of the circle?
