Centrepiece

{ } n. 1. An ornament to be placed in the center, as of a table, ceiling, atc.; a central article or figure. [ 1913 Webster ]

2. Specifically: An arrangement of flowers placed in the center of a table as an ornament while dining. [ PJC ]

3. The central or most important feature of an activity, plan, or object; as, the centerpiece of her campaign was a proposal to slash taxes. [ PJC ]