What is "quiznos"

QIP Holder LLC ( d/b/a Quiznos) is a franchised fast-food restaurant brand based in Denver, Colorado, which specializes in offering toasted submarine sandwiches. The restaurant chain was founded in 1981 by Jimmy Lambatos and sold to Rick and Richard Schaden in 1991, and grew to nearly 5,000 restaurants. As of the end of 2013, the chain had about 1,500 domestic locations and about 600 international locations. Quiznos is the second-largest submarine sandwich shop chain in North America, after Subway.