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I'm not sure that their are any other fields in calibre's default fields/columns that make use of the Y/N type of data.
I can see any number of possible custom columns where, basically, the user wants to know if certain features are available in the book (illustrated, map, etc). Most of these can, alternately, be handled through tags.
However I think it might also serve some "hidden" functionality such as in plugboards, templates and some of the included calibre functionality, such as being a flag for searches. I am completely guessing on that last one though.
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