Is this the Arresting area? I'm not too sure what you call this area
Additional information on the airport would have been nice, but from the markings it looks like it simply is a pad where two aircraft can be positioned at once.
This can be useful where you have a case of eg. one aircraft needing additional time to be ready for take-off while the aircraft behind is all set, or a larger aircraft in front being held back to allow a smaller aircraft to pass it and take off first.
I suppose it is a turning area for making a U-turn after a backtrack. You can see traces from such turns on ground
If this is a military airfield it is the arming area where ground crews do final arming of ordnance on the aircraft before it takes off. The extra space also allows more room for marshalling multiple mission aircraft to compress takeoff intervals.