The number of prints made of any given image in a "limited edition" is called the edition size. It is usually then followed by a number which informs how many are in that particular edition.
For example, Mudgett's limited edition prints were made in "Edition of 100" which means there were only 100 made and it will never be available again. That means the work will no longer ever be available again in the exact same capacity.
The image may re-appear as a product (i.e. a poster, a coffee mug, a rug, a greeting card) but never again will it be available in the same medium, in that size, from the artist again. The finite nature inherent in limited edition prints gives them far more prestige over just any other un-authorized reproduction ultimately making them all the more rare and sought after by collectors.