They’re quite literally the size of a thumbnail. The origin lies in art where small-sized sketches are often used to block out a composition quickly. You can try out a bunch of ideas in a very rough and small sketch form before picking one for a more detailed sketch.
Later on we did the same thing with photography where we produced thumbnail or contact sheets that contained many pictures printed at a very small size to easily sort through a collection and pick which pictures to use for the final product.
And we do the same thing online where we show smaller images for easier use in layouts where a user can click on a thumbnail to enlarge an image.
Latest Answers