In any case, an easy way to remember what the circle and line mean is to think of it as a 1 and 0. I checked the original specs and they do not indicate what the inspiration for the 0 and 1 was, so unless someone can come up with a reference either way, it's unknown. Now, the page has been edited to contest this origin. Previously, the Wikipedia page on this symbol had said the circle comes from 0 and the line comes from 1. Our diverse portfolio includes several topologies, from simple. And glue guns take a few minutes to heat up so that’s annoying (and possibly dangerous) Power switches provide an electrical connection from a voltage source or ground to a load. The next day we got home to find our new glue gun had arrived. Quality German engineering made the heater silent so there was no way to tell by listening. We were recently in a hotel in Berlin Germany and the room heater had the line-circle (| O) symbol on it and we couldn’t remember whether line means on and circle means off, or the line means off and circle means on.
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