I always see some kind of raised platform in a bathroom. This is used to prevent water getting out of the room. I wonder what is it called.
I believe you are describing a threshold.
A strip of wood or stone forming the bottom of a doorway and crossed in entering a house or room.
Typically it is used when two different types of flooring meet (e.g. he tile in a bathroom meeting the carpet in a hallway) to cover either a gap or height difference. It might prevent water from escaping if there is only a small overflow, but that is not its primary purpose.
What do you call the raised platform at the entrance of a room?
My sense: an elevated platform TFD
- (Architecture) a raised floor or other horizontal surface