UNO is the abbreviation that stands for “ United Nations Organisation .” The organisation was established in 1945, after the Second World War. What does UNO mean? The United Nations (UN) is an international organization whose stated aims are facilitating cooperation in international law, international security, economic development, social progress, human rights, and achievement of world peace. The full form of UNO is the United Nations Organisation , and it serves as a discussion forum to debate issues concerning all of humanity. Learn more about UNO on Unacademy. In this comprehensive guide, we will explore the history, structure, functions, and frequently asked questions about the UNO to provide a deeper understanding of this vital organization. The UNO traces its roots back to the League of Nations, established after World War I.