According to the traditional custom in China, only one side of the house is windowed and the other side is closed, so the direction corresponding to the windowed side of the room is the orientation of the room, and the closed side is called sitting orientation.
For example, if the window faces south, the house is called sitting facing south.
The window faces north, and this house is called sitting south facing north.
Nowadays, the direction corresponding to the window is generally called orientation.