The reserved alpha-2 and alpha-3 codes can be divided into the following four categories ( click on the links for the reserved codes of each category ) : User-assigned code elements are codes at the disposal of users who need to add further names of countries , territories , or other geographical entities to their in-house application of ISO 3166-1 , and the ISO 3166\/MA will never use these codes in the updating process of the standard .
User-assigned code elements are codes at the disposal of users who need to add further names of countries , territories or other geographical entities to their in-house application of ISO 3166-1 , and the ISO 3166\/MA will never use them in the updating process of the standard .