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What is the art of creating a picture out of numbers?

What is the word used to describe a piece of art comprised of a single or set of numbers (or text) that creates a larger picture?  For example, if you took a magnifying glass to said type of picture, you might see it is completely made from typing the number 9.  I remember making art in high school that was made from just dots really close together.  But from afar, it resembled a portrait.  I've seen online generators that create pictures almost instantly whenever you type in your text or numbers and select the portrait you want created.  I just cannot remember what it's called?  Any help would be greatly appreciated!

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