What does "axon" refer to in axonometric drawings?

In the context of axonometric drawings, "axon" refers to the concept of axis measurement, which is fundamental to this technique. Axonometric drawing is a type of orthographic projection where the object is represented along multiple axes, thus allowing for a three-dimensional view on a two-dimensional surface without perspective distortion.

In axonometric projections, the axes typically correspond to the three principal dimensions—height, width, and depth. These axes are measured at predetermined angles, maintaining a fixed scale, which allows for accurate and proportional representation of the object's dimensions. This enables architects and designers to present their ideas effectively while allowing viewers to understand the spatial relationships within the design.

Other options do not encapsulate the core aspect of what an "axon" signifies in this context. For example, while modeling techniques and lighting perspectives are relevant to the visual presentation of architectural forms, they do not directly pertain to the definition or function of "axon" in axonometric drawings. Vertical measurement alone is a narrow perspective that does not encompass the full multi-dimensional aspect represented in axonometric view.