A corner.
The place where two points meet is known as an intersection in math.
When two sides (called faces) of a 3-dimensional shape meet, they meet at an edge.
The edge.
an edge
a corner
at an intersection
intersection
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A place where two routes meet are called Super-2.
The place where two or more railway lines meet is called a rail junction.
Often the place where two opposing force meet is called the battle field. Somewhere or sometime they will also meet at a peace table.
No subduction doesn't take place when two oceanic crust meet. When two oceanic crusts meet, it is called a divergent boundary. Crustal features vary such as one like mid-ocean rdges. Subducting takes place when an OCEANIC and CONTINENTAL plate meet not when two oceanic plates meet.
intersecting
A corner.
A place where two or more roads meet is called a JUNCTURE.
A place where railroads meet or cross is usually referred to as a Junction.