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- left -- Command, one input. Abbreviation: lt
- The input is a number, the number of degrees of angle through which
- the turtle should turn counterclockwise. This command does not change
- the position of the turtle, but merely its heading (the direction in
- which it points). The turn will be only approximately correct for the
- floor turtle, because of mechanical errors. For the display turtle,
- the angle will be perfectly reproducible, although it may not look
- quite right on the screen because of the difference in size between
- horizontal and vertical dots. Nevertheless, a display turtle program
- will work in the sense that when the turtle is supposed to return to
- its starting point, it will do so.
-