In Advanved Roadmaps the default issue hierarchy level is Epic -> Story/Task -> Sub-task. There is an option to extend this issue hierarchy with custom named issues.
I am unable to figure out if there is a standard for custom hierarchy levels but I did find two variants on Atlassian sites:
#1 Odyssey -> Initiative -> Epic -> Story/Task -> Sub-task
#2 Purpose -> Vision -> Goal -> Strategy -> Initiative -> Epic -> Story/Task -> Sub-task
Is there any standard for building the hierarchy above Initiative?