Dial-a-flap
This is the colloquial term for MDD's excellent takeoff flap selector wheel, which allows on the DC10 / MD11 any flap setting between 1 and 25 degrees to be preselected for t/o.
This allows you to go into the t/o performance tables and choose the flap setting for the highest RTOW, thus "optimising" your t/o performance for a given runway / temperature, and so lift the highest payload off said runway. Hence this proceedure is known as an "optimum flap takeoff", as opposed to using a fixed-gate flap setting.
This system is also fitted to the MD80 series.
Boeings and....ughhh...Airbus simply have fixed flap settings for takeoff.