“To represent the height, length, and breadth in a single graph/chart…

NCERT (2026-27 edition):
2D - 3D CHARTS/GRAPHS – “… Sometimes graphs/charts can be prepared with three dimensional (3-D) effects. 3-D charts have a third axis, the depth axis (also known as series axis or Z axis), so that data can be plotted along the depth of a chart. In this type the third dimension is represented by Z-axis (Figure 4.11(a) & (b)). For example to represent the volume we require three parameters height (Y-axis), length (X-axis) and breadth (Z-axis).”