n. One billion hamburgers.

Example Citation:
"Experts warned today of a new and deadly threat to our beleaguered civilisation: the 100GB Bug. As most people know, McDonald's restaurant signs show the number of hamburgers the chain has sold. That number now stands at 99 billion burgers, or 99 Gigaburgers (GB). Within months or even weeks, that number will roll over to 100GB.

McDonald's signs, however, were designed years ago, when the prospect of selling 100 billion hamburgers seemed unthinkably remote. So the signs have space for only two numerals.

This means that, after the sale of the 100 billionth burger, McDonald's signs will read '00 Billion Burgers Sold'. "
Firebringer News Service