operating system | Super Nintendo Entertainment System | Nintendo Entertainment System | Android (operating system) | Leadership in Energy and Environmental Design | United States Environmental Protection Agency | Global Positioning System | Centers for Disease Control and Prevention | Transmission Control Protocol | Solar System | X Window System | Korean Broadcasting System | Centers for Disease Control | System of a Down | environmental | Domain Name System | Seoul Broadcasting System | North Carolina Community College System | Mutual Broadcasting System | Bulletin board system | system | Turner Broadcasting System | Program and System Information Protocol | Geographic information system | Ubuntu (operating system) | Tokyo Broadcasting System | Federal Reserve System | air traffic control | Youth system | gun control |