"...characters and numbers are held to be contained in simple scalars, arrays which by convention contain themselves as elements. In each case arrays may be considered to be homogeneous because all of their elements have the same type."
We first defined elements as the arrays within 0-cells of an array. (depth + ¯1 sub-arrays) and then continue to use elements to refer to the 0-cells. Is there not a clearer way to distinguish between them? It appears as though we need to define 0-cells as a fundamental idea.