An oval is used for an endpoint (Start/End/Return). A circle is used as a connector, for instance, if you get to a point where to want to run a subroutine, put a circle connector with a label (a letter, for instance). At the beginning of that subroutine, start it with the same lettered circle connector.
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The line stands for "on" and the circle stands for "off".
A cone shown in a circle
that symbol means trademark
® = Option (alt) + R
It is a symbol used by recovering alcoholics, the three points represent the 3 parts of the disease, the circle means perfection.