The D-8 Organization for Economic Cooperation, also known as Developing-8, is an organisation for development co-operation among the following countries: Bangladesh, Egypt, Nigeria, Indonesia, Iran, Malaysia, Pakistan, and Turkey. The objectives of D-8 Organization for Economic Cooperation are to improve member states' position in the global economy, diversify and create new opportunities in trade relations, enhance participation in decision-making at international level, and improve standards of living. D-8 is a global arrangement rather than a regional one, as the composition of its members reflects. Organization for Economic Cooperation (D- is a forum with no adverse impact on bilateral and multilateral commitments of the member countries, emanating from their membership to other international or regional organisations.[2]

The combined population of the eight countries is about 1 billion or 60% of all Muslims, or close to 13% of the world's population and covering an area of 7.6 million square kilometer,5%of world land area.[3] In 2006, trade between the D-8 member states stood at $35 billion, and it was around $68 billion in 2010.[4] Transactions between the 8 developing countries account for 3.3 percent of world trade. The figure is projected to reach 10–15 percent in the next few years

https://en.wikipedia.org/wiki/D-8_Organization_for_Economic_Cooperation