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MSP430FR6989: What is this image of? A buffer, an inverter, or what?

Part Number: MSP430FR6989

On page 96 of the MSP430FR6989 data sheet (SLAS789D) is a Port 1 diagram. Connected to the ADCs are symbols which I do not recognize. Can somebody please educate me about this symbol and its use? The way it is applied to the ADCs conflicts with the signal direction which I am familiar with.

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