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Tools where you can enter custom expressions (ex: Filter, Formula, Multi-Field Formula, Multi-Row Formula) also feature a list of functions that can be used for reference or double-clicked to insert. The expression used in this case is found in the "Operators" section.
Thank you @CharlieS. I would just like to add this syntax can be used in the Dynamic Select tool as well. My use case involved finding the Fields I had deselected (with a Select tool) with the Field Info tool via Joining and then using the Summarize tool 'concat' function to come up with the syntax to paste into the Dynamic Select tool.