Variable: org-lowest-priority
org-lowest-priority is an alias and customizable for
org-priority-lowest, defined in org.el.gz.
Value
67
Documentation
The lowest priority of TODO items.
A character like ?C, ?B, etc., or a numeric value like 9, 8, etc.
The default is the character ?C, which is 67 as a numeric value.
If you set org-priority-lowest to a numeric value inferior to
65, Org assumes you want to use digits for the priority cookie.
If you set it to >=65, Org assumes you want to use alphabetical
characters.
In both cases, the value of org-priority-lowest must be greater
than org-priority-highest: for example, if "C" is the lowest
priority, it is greater than the highest "A" priority: 67 >
65.