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What is DN on page 245 of these notes shown in the slide below?

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From the same course, you can find the following indication in an earlier set of slides:

Input quantized image pixel values (integers): Digital Number (DN)

From this you can infer that

Salt noise: DN = maximum possible

indicates that salt noise shows up as pixels with the largest possible pixel values (e.g. 255 if the picture is a grey scale picture represented by pixel in the [0-255] range), and that

Pepper noise: DN = minimum possible

indicates that pepper noise shows up as pixels with the smallest possible pixel values (e.g. 0 if the picture is a grey scale picture represented by pixel in the [0-255] range).

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