The phrase "outer loop" refers to a loop that surrounds or encompasses another loop in a computer program. It is used to control the repetition of a set of instructions that are contained within the inner loop. Full definition
I have a biking nemesis: During my regular rides around the six - mile outer loop of New York's Central Park, the big hill at the north (uptown) end of the park invariably sucks the very life out of my aging legs. (scientificamerican.com)
The three outer loops show clear oscillations even as they contract, with distinct periods and phases. (sciencedaily.com)
The Texas National Guard and the Department of Public Safety also used district sites because of Katy's proximity to Interstate 10 and State Highway 99, Houston's third outer loop. (nsba.org)