It gets you off the grid!
Literally: nothing – rank – nothing – crown
Alternately: An ordinary citizen. Having no special prestige from rank, title, official position, or status.
Notes: A variant phrase replaces 冠 with 官 (also pronounced kan!), “bureaucrat.” The meaning is essentially the same, although 冠 suggests aristocratic status while 官 emphasizes government office – keep in mind that the two were essentially indistinguishable for much of Japanese history.