Icon with menu and squares, figures with four straight sides and left-right arrows. Represents a hidden navigation menu, used as a button to toggle navigation menus in applications where screen space is limited and menus need to be collapsed but remain easily accessible. Represents horizontal movement, width adjustment, lateral compression, side-to-side closure, measurement, or x-axis operations. Used in application menu systems, control panels, admin dashboards, developer portals, and content management systems.