A "meet-me room" (MMR) is a place within a colocation centre (or carrier hotel) where telecommunications companies can physically connect to one another and exchange data without incurring local loop fees. Services provided across connections in an MMR may be voice circuits, data circuits, or Internet protocol traffic.
Typically, a meet-me room will discourage or disallow customers from installing large amounts of equipment. However, multiplexing equipment is often welcome in the meet-me room, so that a customer can have a single connection between the room and the rest of their equipment in the building, and the multiplexing equipment can then break that out to allow for direct, private connections to several other organizations present in the meet me room.
An Internet exchange point can also be present in a meet-me room to allow many organizations in the meet me room to interchange traffic without having to make physical interconnections between every possible pair of organizations.
Reference:
One Wilshire: Los Angeles, California
Westin Building: Seattle, Washington
MAE-West (located in Market Post Tower): Downtown San Jose, California
60 Hudson St, New York
111 Eighth Ave, New York
Infomart: Dallas, Texas
350 E. Cermak Rd: Chicago