What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I have translated word "zahl" from German and it is "number". However I still do not understand your question.
Are you referring to Number field? Inside of Number field you can enter only numeric values. You can also use Number tool option like Size, Max Size, Minimum Value, Maximum Value, etc.
Please provide us more details about what are you trying to achieve and we will be happy to assist you.