What is 'YTowOnt9'?

Our (PHP) framework sometimes renders hidden inputs with value `YTowOnt9`. I can't find that string anywhere in the (huge) codebase, and can't figure out where it came from. I decided to Google for that particular string, and the [result][1] surprised me. Over half a million - kind of random - hits. I haven't found any page describing the value itself. It has 0 hits on Stack Overflow. Is `YTowOnt9` some kind of magic string? [1]: https://www.google.com/?q=%22YTowOnt9%22#q=%22YTowOnt9%22