corner: a part of something where two or more sides, lines or edges join the four corners of a square
I hit my knee on the corner of the table.
Write your address in the top right-hand corner of the letter.
the left/right corner
the north-west/north-east/south-east/south-west corner
A smile lifted the corner of his mouth.
in the corner of something a speck of dirt in the corner of her eye
He scored with a shot into the bottom corner of the goal.
She tucked the ball into the corner of the net.
A corner is often the interface between 2 adjacent walls. What is the interface between a floor and a wall as shown in the picture called: a corner, too?
Note: If I translated literally from Vietnamese (my mother tongue) to English, it would be "wall-foot".