Western France, Spain, and other areas skew time zones and shift clocks, in effect observing DST in winter with an extra hour in summer. Nome, Alaska, is at 165°24′ W longitude, which is just west of center of the idealized Samoa Time Zone (165° W), but Nome observes Alaska Time (135° W) with DST, so it is slightly more than two hours ahead of the sun in winter and three in summer. Double daylight saving time has been used on occasion; for example, it was used in some European countries during and shortly after World War II when it was referred to as "<answer>Double Summer Time</answer>". See British <answer>Double Summer Time</answer> and Central European Midsummer Time for details.
What term was used in Britain for double daylight saving time?
Double Summer Time