This tool lists ordered strings with repetition allowed. For the characters abc at length 2, the results are aa, ab, ac, ba, bb, bc, ca, cb and cc.
With n distinct characters and length r, there are n^r strings. This is different from the mathematical nCr count, where order does not matter and items are not repeated.
Use letters or digits and a length from 1 to 12. The generator limits output to 10,000 strings to avoid an oversized page.