Bubbled water in a glass

Bubbled water in a glass, originally uploaded by andreaban2009.

I tried googling re" glasses with etchings on them"....but found nothing much apart from musical etchings. If you order water ( at least in the restaurants I ate in) you get served with glasses like this with little numbers at the side. Am I correct in guessing it's also used to serve beer? Picture taken in a rather nice restaurant where I had the traditional Viennese dish served with coins of potatoes. It was nice and warm indoors...:)