The code allocated by the Post Office to identify a group of postal delivery points.

References:
UK Government Data Standards Catalogue (GDSC), Version 2.1, Agreed 01.09.02. GDSC:
http://www.govtalk.gov.uk/gdsc/html/default.htm

A code used primarily for the delivery of correspondence to ADDRESSES. POSTCODES may also be used to define a GEOGRAPHIC AREA. 

This attribute is also known by these names:

Context	Alias
plural	POSTCODES