The Type list in the Text Form Field Options dialog box contains six field types you can use to achieve different results in a text form field (form field: In a form, a location where a particular type of data, such as a name or address, is stored.).
Accepts text, numbers, symbols, or spaces.
Requires a number. If you want Microsoft Word to verify the input of a number, for example an employee ID number, you need to automate the form (form: A document that contains fill-in blanks, or form fields, in which you enter information. For example, you can create an online registration form in Microsoft Word that uses drop-down lists from which users can select entries.).
Requires a valid date.
Current Date/Current Time
Displays current date or time. Users cannot fill in or change this field.
Uses an =(Formula) field to calculate numbers, such as the sales tax on a subtotal. Users cannot fill in or change this field.