As I understand the octadic is 8 of something.
In relation to sections, what would be a single section called in the octadic?
The comparison I draw from is the quartile, each 'section' being a quarter.
Is there a similar case for the octadic?
To further explain, what would a shaded section in this picture be referred to as? For a quarter, I would refer to this area as a quartile.
Edit: I am aware it may be possible (maybe not) to use 'the eighth'. However, it just doesn't feel correct.