What is a "Partially open bathroom"?

I was browsing London hotels on hotels.com and noticed that many, in the room information section, said they had "partially open bathrooms". This includes one where the room is described as en-suite. The site offers no definition. It seems to be a general hotel-site category, rather than something specific to these hotels.

What does this mean? Is the bathroom partially open because the door doesn't fit the doorway?

Or is there a viewing gallery for spectators?

Or is one wall missing?

I'm aware of the unfortunate existence of "open concept bathrooms" or "open-plan bathrooms", where paying couples are made to hear, smell and (if they don't studiously look away) see each other doing things that humans were intended to do in private, described accurately here as "the ultimate hotel horror". Is this that?

I've tried looking online but the results are inconclusive:

This tripadvisor question's answer completely misunderstands the question
One random person on Yahoo Answers says it's a bathroom with no door or a glass or what sounds like a "Wild West" style saloon door

Best Answer

I think this depends very much on the hotel but I assume the room pictured below could be described as featuring a "partially open bathroom".

Next to the bed is a bathtub which separates the living area from the bathroom area and it can be curtained off. There also is a shower and toilet with a sliding door. The bathroom area is accessible from the corridor on the right without a door.