What does the "N.A." that is often at the end of a bank's official name mean?

National Association
https://en.wikipedia.org/wiki/Bank_of_America

In the modern U.S. the term "national bank" has a precise meaning: a banking institution chartered by the Office of the Comptroller of the Currency ("OCC"), an agency in the U.S. Treasury Department, pursuant to the National Bank Act. The inclusion of the word "National" in the bank's name or the designation "National Association" or its abbreviation "N.A." is a required part of the distinguishing legal title of a national bank, as in "Bank of America, N.A."

https://en.wikipedia.org/wiki/National_bank#United_States

Not applicable