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Overlapping Circles Circuit Symbol
Im reading A Designer's Guide to Instrumentation Amplifiers and I have a question about the one circuit symbol. I know a single circle typically represents a voltage or a current source. In the third chapter of this book they have a symbol I've never seen before. This symbol is two overlapping circles. I know that they are base current compesenators because they are labeled. Is this a standard symbol and what do they typically represent?
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