Delivery point
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In a postal system, a delivery point (sometimes DP) is a single mailbox or other place at which mail is delivered. It differs from a street address, in that each address may in fact have several delivery points, such as an apartment flat, office department, or other room. Such a building (mainly only residential) is often called a multiple-dwelling unit (MDU) by the USPS.
In the U.S., the delivery point is normally encoded in the POSTNET barcode, in addition to the ZIP+4, although it is not part of the ZIP Code itself. Since each city block or section of a rural route has a different sub-ZIP (the +4 part), and address numbers generally increase by 100 per block, the DP is the last two digits of most addresses. It may also be the last two digits of a suite number, the floor number, or an arbitrary number assigned by the local delivery unit. However, the normal practice in the U.S. is to assign each post office box its own ZIP+4 code; in such cases, the delivery point is redundant.