Well... it looks too complicated for anyone in the whole universe. :\
Answer:
A Direct Current (DC) electromagnetic field refers to a constant or static DC electric or DC magnetic field emission which has a frequency of 0 Hz. DC magnetic fields can also be created from a DC power source of electricity such as battery power, solar power, and wind power.
If you are in war, Wearable Technology would provide Night Vision which would spot Hostile Soldiers in forests or in the dark.
In the business cycle, the term that best fits the labeled point on the graph of Production output vs Time is Contraction