"Numbers" fits, yes. Is it the best answer, or the one designated as the "correct" answer by the riddle's poster? Eh, probably not. A lot of riddles have answers that the one who thought of them never anticipated, especially here. Take this one, which I came up with a while ago: Slammed into my home with a powerful blow, Into a place I did not wish to go, Governed by beings who heed not my pleas; They will do anything to satisfy their needs. Beaten and bent with no end in sight, And still they will not leave me be. Deeper and deeper I sink, Until I fit, like a lock and a key. I was intending the answer to be "nails" (which works perfectly fine), and then Vexx went ahead and answered "Lockpick". See what I mean?