A single-hung window is a tall rectangle with two sashes.
A double-hung window is a tall rectangle with two sashes.
Casement windows feature one panel (or sash).
Sliding windows are wide rectangles with two sashes that open horizontally.
Bay windows are a type of projection window featuring 3-5 panels
The typical awning window is a wide rectangle or square with a hinge at the top.
A hopper window is the reverse of an awning window.
Round windows are circular, often called porthole windows.
Transom windows are small and go atop door frames.
Skylights are rooftop windows