noun
Official name of the United Nations organ responsible for maintaining international peace and security.
国連安全保障理事会は、国際平和の維持に責任を負っている。
The UN Security Council is responsible for maintaining international peace.
国連 is the abbreviation for the United Nations as a whole, while 国連安全保障理事会 refers specifically to its Security Council.
Compound of 国連 (United Nations) + 安全保障 (security) + 理事会 (council).