from NECCO. Here is their website showing the SkyBar: http://www.necco.com/OurProducts/Products.asp?ProductSubCategoryID=3#Product16
they mean that they are numbers of or to pertaining to the numbers on the product. Identifiers.
it is a storage area in a bar.
The word "bar" is defined as:Something that obstructs or prevents passage, progress, or action as:a: the destruction of an action or claim in law; also: a plea or objection that effects such...
only when the numbers, letters or words bottom line has something in common with their neighbors.