Master probably means differant things in various areas.
Here in the Mountain State, it allows you to work without supervision, not that that stops journeymen from working on their own. It also means that you can do design work, whatever that is.
Basically, electricians licenses in WV are about worthless.
At the other extreme, and off the subject, Florida does not require an electrician to be licensed. But if you are a Beautician, you need 1200 hours of training & have to pass a test. Go figure.
Tom