Oh well that's fine.
My brain just operates very strictly as:
Junior = apprentice, first job or similar.
Mid = journeyman, "worked another job before". Independent, trusted to be delegated to for specific things, but doesn't quite have a personal brand.
Senior = Master. Proven track record, proven reputation of delivering, capable of leadership inside a technical project. Has and maintains a reputation as someone you can trust.
Principal = Mentor to seniors.
Ofc there are shades of grey between junior and mid, because junior-ship takes like 2-3 years to grow out of.
The list of work able to be delegated to someone at the start is not all that large in many cases.