There are multiple definitions:

1. Union of International Associations(English)

   • a pioneer in the research, monitoring and provision of information on international organizations, international associations and their global challenges since 1907
   • YBIO
   • Organizations (international), Organizations (documentation), Monitoring
   • https://uia.org/

2. unruptured intracranial aneurysm(English)

   • IA, PSG, CAC, CACo
   • Vascular disease, Anatomy, Brain (dys)function, Therapeutic approaches
   • https://doi.org…062-022-01199-2
   • https://doi.org…18.1.FOCUS17714