= Polarity symbols
{wiki}
Positive center is way more popular: https://gearspace.com/board/electronic-music-instruments-and-electronic-music-production/1222518-center-negative-vs-center-positive-power-supply.html
\Image[https://upload.wikimedia.org/wikipedia/commons/thumb/2/2e/Polarity_marking_center_positive.svg/425px-Polarity_marking_center_positive.svg.png]
\Image[https://upload.wikimedia.org/wikipedia/commons/thumb/d/d4/Polarity_marking_center_negative.svg/425px-Polarity_marking_center_negative.svg.png]
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