Absolute polarity = phase ?
"Two oscillators that have the same frequency and different phases have a
phase difference, and the oscillators are said to be
out of phase with each other. The amount by which such oscillators are out of step with each other can be expressed in
degrees from 0° to 360°, or in
radians from 0 to 2π. If the phase difference is 180 degrees (π radians), then the two oscillators are said to be
in antiphase. If two interacting
waves meet at a point where they are in antiphase, then destructive
interference will occur. It is common for waves of electromagnetic (light, RF), acoustic (sound) or other energy to become superposed in their transmission medium. When that happens, the phase difference determines whether they reinforce or weaken each other. Complete cancellation is possible for waves with equal amplitudes." wikipedia - phase