TURRET. Cylindrical or polygonal fortification usually built at the corner of a fortress.
Represents an extension to the defenses of a medieval fortress, protecting adjacent walls. Their use for military purposes faded with advances in weapons technology and warfare in general.
Today they are used for decorative purposes.
A turret can have a circular top with crenellations as seen in the picture at right, a pointed roof, or other kind of apex. It might contain a staircase if it projects higher than the building; however, a turret is not necessarily higher than the rest of the building; in this case, it is typically part of a room, that can be simply walked into.
ROOK is a piece in the strategy board game of chess. Each player starts the game with two rooks, one in each of the corner squares on their own side of the board.
The rook moves horizontally or vertically, through any number of unoccupied squares. The rook also participates, with the king, in a special move called castling.