Vertical sliding window
What is a vertical sliding window?
A vertical sliding window is a window that opens upwards or downwards.
The term vertical refers to the direction of movement of the moving part of the window. It moves vertically from top to bottom or from bottom to top.
The term vertical sliding window is used to distinguish the type of window from horizontal sliding windows clearly. As these are more common, they are often referred to simply as sliding windows without specifying the direction of movement.