In the datasheet for a A3503 Hall Effect Sensor, I saw a circuit diagram labeled 'Functional Block Diagram', and it shows a symbol I have not seen before. It's shown here between 3 - Output and 2 - Ground.
What is this supposed to represent?
The full datasheet is available here
Answer
It's the symbol of a current source.
There are different symbols used to represent a current source:
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