The bump you see towards the top of the glass improves the grip of the glass, prevents the glasses from sticking together when stacked and adds strength to the glass which reduces chipping (or, improving the chances there will be "no-nicks" on it). The standard measure of this glass is 20 oz. to accommodate beers with large crowning heads, and more beer in general (. The head will typically start where the bump ends towards the top of the glass (about one inch from the top.
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