Together these form an N-shaped structure, with the loop allowing the two helices to assume a parallel orientation.

Internal loops allow attachment of a sleeping bag liner, sold separately.

An 11-mile, one-way loop allows visitors to see a small slice of human history in the Smokies.

Three loops allow the climber to pass a knot in the rope, a difficult task without a third loop.

Then he snipped the original wire, opened the door as far as his loop would allow.

Three passing loops along the line would allow four trains to run, at speeds of up to 90 km/h.

The loops at both sides allow the stitches to be crossed less tightly.

The loop would allow half-hourly services to run between Glasgow and Kilmarnock.

A loop allowed locomotives to run round their carriages and a siding ran to the goods shed.

This ensured that only one train at a time was on each end of the line; a loop at Orwell allowed two trains to pass.