The fast food chain known for its square-shaped hamburgers is Wendy's.
Wendy's distinctive patties are square rather than round, with corners that extend beyond the circular bun. The design was intended to suggest that customers receive a generous portion of fresh beef rather than a small, perfectly uniform patty.
Founder Dave Thomas opened the first Wendy's restaurant in Columbus, Ohio, on November 15, 1969. The square-patty idea was influenced by Kewpee Hamburgers, a restaurant chain in Thomas's hometown of Kalamazoo, Michigan, that also sold square hamburgers.
The restaurant was named after Thomas's daughter, Melinda Lou “Wendy” Thomas. The square burgers are sometimes mixed up with Wendy's other signature items, especially the Frosty, a thick frozen dessert. Wendy's later slightly rounded some patty edges, but the square shape remained a central part of the brand's identity and advertising.