shape

[OED]: 1.    a. External form or contour; that quality of a material object (or geometrical figure) which depends on constant relations of position and proportionate distance among all the points composing its outline or its external surface; a particular variety of this quality.

shape

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Source: 
DiBiase, et al. (2006)
Topic AM3-3. Identify situations in which shape affects geometric operations; Explain what is meant by the convex hull and minimum enclosing rectangle of a set of point data; Explain why the shape of an object might be important in analysis; Exemplify situations in which the centroid of a polygon falls outside its boundary; Compare and contrast different shape indices, include examples of applications to which each could be applied; Develop a method for describing the shape of a cluster of similarly valued points.

shape

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Source: 
Kastens and Ishikawa (2006)
The shape of a natural object (including its size and orientation) carries clues about its history and formative processes. To begin with the most famous examples of ascribing meaning to the shape of natural objects in the history of geosciences, Alfred Wegener (1929) noted the jigsaw fit of the coastlines of Africa and South America, and inferred that the continents had previously been connected (pp. 57-58). . . .

shape

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Source: 
Kaufman (2004)
...readily observable spatial properties (of an object) are size and shape
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