Mail uom

I think you meant "mail UOM"!

UOM stands for "Unit of Measure". In the context of mail, UOM refers to the unit of measurement used to calculate the weight or volume of a package.

For example, if you're shipping a package that weighs 2 pounds, the UOM might be "pounds" (lb). If you're shipping a package that measures 12 inches in length, 8 inches in width, and 4 inches in height, the UOM might be "inches" (in).

In the United States Postal Service (USPS), the most common UOMs used for mail are:

When shipping a package, it's important to accurately declare the UOM to ensure that the correct postage is applied and to comply with postal regulations.