https://i.imgur.com/zXAwnbK.png — (I am using Safari 13.0.3 on macOS Catalina 10.15.1)
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Edit: After seeing the image posted by @iruoy — https://i.imgur.com/OH3QTXQ.png — I have to disagree with you because the circle represents a zero (low voltage - FALSE) and the vertical line represents a one (high voltage - TRUE). If you studied computer science, logic, electrical engineering, or attended any basic course on electronics you would know that ones-and-zeroes are the written representation of an electric current, in fact, they are the basics of computing: Bits.
Here is more information about the power symbol:
• https://en.wikipedia.org/wiki/Bit
• https://en.wikipedia.org/wiki/Power_symbol
• http://www.decisionsciencenews.com/2016/10/28/off-switch-rem...