Plans are a set of two-dimensional diagrams or drawings used to describe a place or object, or to communicate building or fabrication instructions.

On a two-dimensional diagram, sometimes a vector perpendicular to the plane of the diagram is desired.

Spock pressed an illuminated yellow button on his science console and the starscape on the main viewer was replaced by a two-dimensional diagram of a solar system.

Merriam recognized that two-dimensional diagrams of elevation and aspect described plant community distribution in the southern Rocky Mountains.

Nomogram - a two-dimensional diagram designed to allow the approximate graphical computation of a function: it uses a coordinate system other than Cartesian coordinates.

These two-dimensional diagrams portray worldlines as curves in a plane that correspond to motion along the spatial axis.

In his paper, Milgrom arranged the typical acceleration of various physical processes in a two-dimensional diagram.

This can be illustrated schematically with a two-dimensional diagram of a sodium chloride crystal lattice:

Can the complexities of opera, with its heated passions and secret schemes, really be explained in a two-dimensional diagram?

The problem arises from the attempt to represent space-time on a two-dimensional diagram.