A strip shaped like a "T" that helps to eliminate light gaps between left and right pane when no rabbet stile exists (see rabbet stile).
Button Plug:
A plastic plug used to cover hole where tension screws are located.
Café style shutters:
Panels that cover the lower portion of the window.
Used to support and or increase the window depth clearance allowing louvers on back side of panel to clear obstructions.
Hoffman Keys:
Shaped like a butterfly, they are fasteners used in connecting miter corners of frames.
Divider Rail:
A rail that adds strength to tall panels and divides them into two sections in which louvers operate independently of each other.
Double Hung:
Two independently operated panels, one mounted on top of the other.
Hidden tilt bar:
Tilt bar is “hidden" behind shutter panel and attached to the side of the louvers.
Inside mount:
A shutter mounted inside of a window opening.
The movable blades within a shutter panel that control light and privacy.
A cavity cut into the wood.
Mortised Hinges:
Hinges that require a mortise for proper installation (see mortise).
Mouse Hole:
A cavity in the rail in which the tilt rod rests.
Non-Mortised Hinges:
Hinges that do not require a mortise for proper installation.
Outside mount:
A shutter panel mounted outside of the window case.
A shutter panel consists of at least two stiles, two rails, one tilt rod, and any number of louvers.
Rabbet Stile:
A profile cut into the stile wich allows them to overlap. Prevent light from penetrating between the panels.
The horizontal top and bottom members of a shutter panel.
Repair Pins:
Spring loaded louver pins designed to retract flush for the purpose of inserting a louver into an existing shutter panel.
Bottom horizontal member of window opening.
Stile-Louver Clearance:
Space between inside of a stile and louver end. Well constructed panels generally have 1/32" clearance
Vertical member of the shutter panel to which the louvers are attached.
Radial louvered shutters, designed for Palladian openings.
Tension Screw:
A screw used to adjust the tension of louvers.  They are recessed into outer edge of stile often covered with a button plug.
Tilt Rod: 
A vertical bar located on the front of the panels attached to louvers.  Used to adjust the position of louvers.
A vertical post used to support different sections of shutters in wide windows.
Metal hardware used to support panels from overhead in Bypass and Bifold installations.
Window Depth:
The distance from the surface of the wall to the closest part of the window.