A famous watch brand has a slogan (I suppose) inscribed on their products: "Oyster Perpetual". What does it mean?
'Oyster Perpetual' is merely the name of the watch, like 'Macbook' is the name of an Apple laptop, for example.
The 'perpetual' refers to the way the watch winds itself whenever the wearer moves their wrist, meaning it never winds down. Perpetual means continuous or everlasting.