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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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If either a public officer or any one else saw a person attempting to cross a bridge which had been ascertained to be unsafe, and there were no time to warn him of his danger, they might seize him and turn him back without any real infringement of his liberty; for liberty consists in doing what one desires, and he does not desire to fall into the river. -Mill
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