What is the word for the corner where ceiling and wall meet in a house?

In a square room in a house, what is the word for the corner where one of the walls meets the ceiling?

I kept thinking it was a word like “eaves”, but that turned out to be the overhang. I have googled a few things, but most of it is irrelevant about topics like mold.

---

Edit, for clarity:

In math, two distinct planes may intersect on a line, and 3 distinct planes may intersect at a point. Lines segments between two points are sometimes called edges.

I said “square room”, but what technically meant was “cube room”.

I said “corner where one of the walls meet the ceiling” because I was thinking of the phrase, “Stand with his nose in the corner.” I’ve heard the word “corner” refer to BOTH the line of intersection between two planes AND the point of intersection between 3 planes, when people talk about rooms. As in, “Painting yourself into a corner.”

I should have used the word “edge”, because I’ve only heard “edge” referred to as the LINE of intersection between two planes. I think of “edge” as a more specialized word, for someone doing graph theory or geometry. “Edge” would have been a much better word to use in asking because of the reduced ambiguity.

To be most clear, the reason I accepted the answer is because of the word crown. Crown can be used to distinguish the difference between the edges where the walls meet the ceiling vs where the walls meet the floor.

I’m sorry for the confusion.