The following image shows an example of what I found in my hotel room at the Holiday Inn in Bensalem, PA.
Makes a lot of sense because no one in housekeeping spoke english.
I checked a few of the panelboards in the hotel, and found many directories that did not meet with the rules in Article 110 and 408!
That's another story of my life as a road warrior!
What symbols and messages could we use to identify the branch circuits?