Original: ISO 3166-2 : BR is the entry in ISO 3166-2 , part of the ISO 3166 standard published by the International Organization for Standardization ( ISO ) , which defines codes for the names of the principal subdivisions of Brazil ( whose ISO 3166-1 alpha-2 code is BR ) .
Simplified: ISO 3166-2 : BR is an ISO standard which defines geocodes : it is the subset of ISO 3166-2 which applies to Brazil .