Plain English Meaning
A page in the Chart Supplement, marked with a tab so you can find it quickly, that tells you who to call to find out whether a piece of restricted or special airspace is active.
Full Definition
A tabbed reference page in the FAA Chart Supplement (formerly Airport/Facility Directory) that lists Special Use Airspace (SUA) along with the controlling agency to contact for status information such as activation times and altitudes.
Context Anchor
Seen when using FAA web-based information about special use airspace, where a pilot may switch between a map view and a list view.