hat
n.— «They contended city officials meddled with their original scheme, rejecting an innovative plan for terra cotta facade panels that would have screened the tower from the rain. The Department of Planning and Development insisted on brick, the architects said, and ordered up a distinctive top—a “hat,” in architectural parlance.» —“Tower doesn’t live up to its prime real estate” by Blair Kamin Chicago Tribune (Illinois) Jan. 13, 2008. (source: Double-Tongued Dictionary)