A point on the picture plane where all the parallel lines appear to converge is called:

In art or technical drawing, especially in perspective drawing, when you're trying to make a 2D picture look 3D, something interesting happens:

All lines that are parallel in real life (like railway tracks or the sides of a road) seem to come together as they go farther away.

On the paper, these lines appear to meet at a single point.

That special point is called the Vanishing Point.

A vanishing point is where parallel lines seem to meet in the distance on your drawing — even though they never meet in real life.

Example:

Imagine looking down a long straight road.

The two sides of the road look like they are getting closer and closer...

Finally, they seem to meet at a point far away.

That point is the vanishing point.

Vanishing Point – the point on the picture plane where all parallel lines appear to converge.