GNU Emacs Manual - RegRect

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## Saving Rectangles in Registers

A register can contain a rectangle instead of linear text. The rectangle is represented as a list of strings. See section Rectangles, for basic information on how to specify a rectangle in the buffer.

`C-x r r r`
  Copy the region-rectangle into register r (`copy-rectangle-to-register`). With numeric argument, delete it as well.
`C-x r i r`
  Insert the rectangle stored in register r (if it contains a rectangle) (`insert-register`).

The `C-x r i r` command inserts a text string if the register contains one, and inserts a rectangle if the register contains one.

See also the command `sort-columns`, which you can think of as sorting a rectangle. See section Sorting Text.

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