tag
n.— «In addition, Tuck Hinton designers are moving the entrance of the building from its center to its right side and, in the process, creating a so-called “tag chamber”—that is, an external vestibule in which quartets can sing (in barbershop quartet singing parlance, a “tag” is a portion of a song).» —“Creating Places: McQuiddy Building to sing harmony with new look” by William Williams City Paper (Nashville, Tennessee) Apr. 23, 2007. (source: Double-Tongued Dictionary)