one more question

Thanks a lot!

What does it mean in France: "a single room" "a single deluxe" "A double room"? Can two adults book one single room?

In U.S, hotel booking for two adults is always as follows:" a room with one king-size/queen-size bed" or "a room with two twin-size beds". I don't think americans use "single room" or "double room", at least I've never heard of that.  

Thanks.