Echelon refers to a level or rank in an organization, system, or hierarchy. It is often used to describe the different layers of authority or responsibility within a company or military structure. The term can also apply to social classes or groups, indicating a stratified arrangement based on various criteria. In a broader context, Echelon is also known as a global surveillance system operated by the United States and its allies, including Australia, Canada, New Zealand, and United Kingdom. This system collects and analyzes signals intelligence from various sources, playing a crucial role in national security and intelligence operations.