Here is a chart that gives the priority of different devices used in a time machine. Which device is the most important?
DeviceMore numbers stars = High priorityTime direction Module★★★★★Batteries★★★AYC(Analog Year counter)★Toolbox★★
Time direction Module
A pictograph is just a chart which helps us to compare quantities by looking at pictures. As more number of stars correspond to a higher priority, the device having the highest number of stars will have the highest priority. That device, as you can see from the table is Time Direction Module.
DeviceMore numbers stars = High priorityTime direction Module★★★★★Batteries★★★AYC(Analog Year counter)★Toolbox★★