Look more closely. Does it say "AFF" perhaps? That means "above finished floor".
What does KS mean on a floor plan? Knee Space
"DB" on a floor plan commonly stands for "dining room" or "dining area." It indicates the space in the floor plan designated for dining activities.
Floor plan mean Scottish plan. It shows the distance of room from the floor and physical appearance of room walls and all other features of rooms.
main panel
Water heater
poo extra
standard tile
Pulte Planning Center
"K.S." on a floor plan most likely stands for kitchen sink, indicating the location where the kitchen sink will be placed.
Ceramic Tile Wall.
Work in Revision. This means that this area of the drawing may change.
In a floor plan, "DN" stands for "Down", indicating a staircase or level change going downward from the current floor. It tells you that the stairs or steps in that location lead to a lower level—such as a basement or the floor below. Similarly, "UP" would indicate stairs going upward to the next floor.