Non-Annex I Parties/Countries (or Non-Annex B countries)
Definition
Parties, mostly developing nations, that have ratified or acceded to the United Nations Framework Convention on Climate Change and are not included in Annex I of the Kyoto Protocol.
Source
IPCC Glossary of Climate Change Acronyms: http://unfccc.int/essential_background/glossary/items/3666.php
Alternative definition
Refers to countries that have ratified or acceded to the United Nations Framework Convention on Climate Change that are not included in Annex I of the Convention.
Alternative source