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# k-cell

A cell of rank k is also called a rank-k cell or k-cell. A 0-cell is an atom, a 1-cell is a list, a 2-cell is a table, and so on. If the rank of the cells of a noun is given, then the frame is whatever is left over of the shape of the noun.

Negative numbers are also used, as in _2-cell and _1-cell; the frames of such cells have length indicated by the magnitude of the numbers. You have seen _1-cells before: they are items.

      abc =. 4 3 2 $ i. 24

The noun `abc` can be thought of as:

- a `4 3 2` frame of 0-cells

- a `4 3` frame of 1-cells

- a `4` frame of 2-cells

- an empty frame of a 3-cell

A more general way of phrasing this is:

- a rank 3 frame of 0-cells

- a rank 2 frame of 1-cells

- a rank 1 frame of 2-cells

- a rank 0 frame of 3-cells

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