Astragal:
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.
 
Frame:
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.
 
Louvers:
The movable blades within a shutter panel that control light and privacy.
 
Mortise:
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.
 
Panel:
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.
 
Rail:
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.
 
Sill:
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
 
Stiles:
Vertical member of the shutter panel to which the louvers are attached.
 
Sunburst: 
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.
 
T-Post:
A vertical post used to support different sections of shutters in wide windows.
 
Track:
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.