I’ll use the cliche meme of “I was today years old when I learned where the name comes from”. Just made the connection when I read this article, and I love Pulp Fiction.
But I too am not a native English speaker. Just always accepted the clunky acronym as the reason for the name.
Before electricity, people had to make sure as much daylight as possible got into their buildings. Looks like this might be a large room, so large windows make sense.