Fluted Column, Ionic Capital
1. fluted column (blue)
A groove (or channel) used decoratively as along the shaft of a column. There are usually many such flutes running parallel.
2. Ionic capital (red)
The top part of a column is called the Capital. Ionic refers to the Ionic Order of architecture, originated by the Ionian Greeks. An Ionic Capital has large scrolls on top called volutes. It also has moulded bands on the top called fasciated entablature. Ionic Capitals usually also have an ornamented bar, called a frieze, continuously running around the the top.
There are four of these columns inside the main hall of Carpenters' Hall. Originally they marked the boundaries of a hallway that ran down the middle of the Hall.