kill-rectangle

Kill the rectangular area between point and mark.

This command removes the characters in the rectangular area between point and mark, and puts them in a kill buffer. By default, the deleted area is replaced with spaces and tabs, and text to the right of the rectangle remains in the same position. With a numeric argument, this command removes the deleted rectangle and shifts leftward any text to its right. See the kill-rectangle-removes variable to make this command remove text by default. Also see the delete-rectangle command.

More info:

Rectangle Commands
kill-rectangle-removes

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kill-process Command Reference kill-region