Cremone Bolt
The cremone bolt is a traditional locking mechanism based on a vertical rod
A cremone bolt secures a window or door with a surface-mounted vertical rod. The turn of a handle raises or lowers the rod into a locked position at the bottom or top of the door. This traditional mechanism is common on French doors and casement windows, but it is not as secure as modern locks and is mostly used indoors.
Mounted on the surface instead of internally, the cremone bolt is more decorative than secure.
A cremone bolt has vertical rods that slide into a locked position with the turn of a handle.
This surface-mounted security bolt is similar to the cremone bolt, but the rod does not run the length of the door. A flush bolt is the modern equivalent of this, but it is recessed into the door and hidden from view.
Another common bolt, shown securing the bottom of this gate, is called a cane bolt, due to its shape.