The abbreviation for Indiana is IN. This two-letter code is part of the United States Postal Service's system for abbreviating state names, adopted in 1963. The abbreviation system aims to make addressing mails quicker and more standardized, ensuring efficient postal services. While Indiana has a rich history and diverse culture, when it comes to mail, it's simply referred to by the letters 'IN'. It's like a sort of nickname, but for postal services!
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