1. Main Frame – all four side pieces-head, jambs, and sill (everything except the glass panels)
2. Head - top of the main frame of the window
3. Jamb – sides of the main frame of the window
4. Sash – part of the window that moves or opens
5. Muntins – grids between the glass forming rectangular patterns
6. Meeting Rail – the part of the lower sash that overlaps the upper sash
7. Cam Locks – locking system that provides security and a tighter weather seal at the meeting rails
8. Tilt Latches – located on the meeting rail and top hand rail, retract to allow the sash to tilt in for cleaning.
9. Night Latch – a retractable piece that allows the lower sash to be raised 2-3" before hitting latch
10. Spiral Balances – support the weight of the sash and allow positioning the sash for cleaning or ventilation.
11. Hand Rail – the part of the sash used to raise and lower the sash
12. Nailing Fin – an attachment (fin) around the perimeter of the window used to nail through when installing a window in new construction applications
13. Jamb Stop – part of the jamb that extends out to make a weather seal for the exterior side of the top and bottom glass panels. Greatly reduces air infiltration around sash. Not present on most windows.
    

Parts of a Traditional Wood Window

1. Blind Stop – wood used to hold the upper sash in place on the outside. The storm window is also screwed to this wood from the outside.
2. Parting Stop – wood used to hold the outside of the lower sash and the inside of the upper sash in place
3. Inside Trim – wood used to hold the lower sash in place on the inside
4. Inside Stool – wood that projects to the inside as trim at the area where the lower sash seals when it is closed
5. Sill – the bottom part of the main frame that is usually sloped to the outside for water drainage