I've heard them called bats. They are like a glass cigarette and you pack the end by dipping it in ground herb. Yes, basically a glass tube There's also an Indian type pipe that might be what you're talking about, but I totally can't remember the name.
a one hitter is what me and my friends call it, its just a glass tube that you stuff the end w/ weed, you can usually only get one hit out of it, hence why it's called what it is