The battery symbol was inspired by the looks of voltaic batteries from the early 19th century.pic.twitter.com/NhPaTEhuBf
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As a high school student, I understood the symbol of the capacitor, the inductor, .... but not the constant voltage 
This is not accurate the first symbols for capacitors were called condensers and were inspired by layden jars.pic.twitter.com/1NhQC4w8Sn
Essential for historical research of patents from just a hundred years ago.
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