The short line of the symbol is the negative terminal. The longer line is the positive terminal. Tip: You don’t have to draw the + and – symbols but they can be helpful. The switch symbol (off ...

When drawing circuit diagrams, rather than drawing detailed components, we use simple symbols to represent the different components.

Tom Steyer in a BBC interview in June 2019 - with the mark on his hand He appears to have started drawing the symbol in the winter of 2017, and in May 2018, he told Politico it was a reminder to ...