I just bought a Jagermeister gift set and I can't figure out the meaning of the markings on the shot glass?

On the shot glasses that came in the set it has two marks seemingly guide marks to some sort of shot “recipe”. The first mark is a horizontal line and 2 cl; the next mark is a little higher and has another horizontal line that says 4cl ARC. There is a similar question posted that claims this is the glass manufacturers brand name but I find that hard to believe because of the location and the horizontal line next to this marking. Can anybody help? Please let me know your thoughts. Thanks!