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Numbers
Glossary "U"
UDF Universal Disc Format. Standard developed for DVD, other new formats, that allows for backward compatibility with CD format counterparts.
Undeliverable-as-addressed (UAA) Mail that the USPS cannot deliver as addressed and must forward to the addressee, return to the sender, or send to a mail recovery center.
Unique ZIP Code A ZIP Code assigned to a company, government agency, or entity with sufficient mail volume, based on average daily volume of letter-size mail received, availability of ZIP Code numbers in the postal area, and USPS cost-benefit analyses.
United States Code (USC) The official restatement of the general and permanent laws of the United States; 39 USC contains laws relating to the USPS