A scale drawing showing information about a fire scene. 

1610s, from French diagramme, from Latin diagramma, from Greek diagramma "geometric figure, that which is marked out by lines," from diagraphein "mark out by lines, delineate," fro [..]

Graphic designs that explain rather than represent

A graphical depiction of all or part of a model. [D04825]

a drawing intended to explain how something works; a drawing showing the relation between the parts make a schematic or technical drawing of that shows interactions among variables or how something is [..]

A drawing explaining the shape, layout or workings of something.

a plan or drawing to show what a thing is, or how it works

A figure, usually a line drawing, that illustrates a geometrical theorem.

A figure, chart, or graphic design intended to illustrate or explain a principle, concept, or set of statistical data. Also, a drawing, sketch, or plan that shows the steps in a process or the relatio [..]

(n) a drawing intended to explain how something works; a drawing showing the relation between the parts(v) make a schematic or technical drawing of that shows interactions among variables or how somet [..]

A simplified drawing or schematic representation showing the appearance, structure, workings, or underlying concept of a design

A formal drawing showing the arrangement of components or devices.

a chart showing position of the players and the cards they hold

For a question which specifies a diagram you should present a drawing, chart, plan, or graphic representation in your answer. Generally you are expected to label the diagram and in some cases add a brief explanation or description.

A plan, drawing, sketch or outline to show how something works, or show the relationships between the parts of a whole. *en|schematic

===Noun=== ====a figure showing geometric and other relationships between objects====