This is 20CM Dupont Wire Color Jumper Cable, 2.54mm 1P-1P Male to Male 40PCS. A very flexible and easily detachable cable to the no. of wires according to your requirement. It has 1Pin male to the 1pin male header with both ends. Also, it is compatible with 2.54 mm mil spacing pin headers.
It labels For Arduino Nano version 3.0, however you can still use this adapter for the older version (just have to remember that A0-A7 are in the reverse order). You can use this adapter to easily hook up Nano to an outside world via hook up wires.