The UN Economic and Social Council has 54 members, elected by the General Assembly for three-year terms
Background
The Economic and Social Council (ECOSOC) is one of the six main bodies of the United Nations. All six were established under the UN Charter when the Organization was founded in 1945. ECOSOC has 54 Members, elected by the General Assembly for overlapping three-year terms. It is the principal body for coordination, policy review, policy dialogue and recommendations on economic, social and environmental issues. It serves as the central mechanism for the activities of the UN system and its specialised agencies in those fields, and it supervises subsidiary and expert bodies. The United Nations describes it as its central platform for reflection, debate and innovative thinking on sustainable development.
In plain words
ECOSOC Economic and Social Council — The UN's principal organ for economic, social and environmental coordination.