AS NZS 2632.3:2015 Codes for the representation of names of countries and their subdivisions
5.1.4 Deletion of country name (see 4.2.5)
The original alpha-2 code element is followed by the two letters HH to indicate that the country is absorbed by neighbouring countries and the country name ceases to be used.
EXAMPLE 1 NEUTRAL ZONE (NT) deleted in 1 993.
Code element for formerly used country name for NEUTRAL ZONE: NTHH.
In the case of a second deletion of an ISO 31 66-1 code element, which would have been reattributed to represent another country name, the corresponding ISO 31 66-3 alpha-4 code element shall finish by the two letters XX instead of the two finishing letters HH as in the first deletion.
EXAMPLE 2 From 1 974 to 1 993, the alpha-2 code element CS represented the country name CZECHOSLOVAKIA. It was then deleted and included in ISO 31 66-3 as CSHH. But CS was then reattributed between 2003 and 2006 to repre- sent the country name SERBIA AND MONTENEGRO, and was then deleted and included in ISO 31 66-3 as CSXX.
5.1.5 Change of country name (only alpha-3 code element affected)
The original alpha-2 code element is followed by the two letters AA to indicate that a substantial change of the country name resulted in the change of only the alpha-3 code element but not the alpha-2 code ele- ment.
EXAMPLE BYELORUSSIA (BY/BYS) name changed to BELARUS (BY/BLR).
Code element for formerly used country name for BYELORUSSIA: BYAA.
5.2 List of formerly used country names
Clause 8 lists the short forms in English of the former- ly used country names together with their obsolescent alpha-2 code elements, obsolescent alpha-3 code el- ements, obsolescent numeric-3 code elements (where relevant), the period (years) during which these were valid, the alpha-4 code elements for formerly used country names and remarks, such as the kind of ac- tion that caused the removal of the names from the different editions of ISO 31 66 and ISO 31 66-1 , short forms of new names presently covering the same ar- eas, their new code elements, etc.
Clause 9 lists the same information as Clause 8 but in French.