Perhaps you are asking why people tend to capitalize Word when referring to the Bible even though this is not done in scripture. I think it is a matter of respect for the Bible. In the same manner, many people (myself included) tend to capitalize pronouns referring to God.
DS-11 Application Form for New Passport. Form DS-11. The DS-11 Application Form for New U.S Passport is an application form that should be used when you are applying for a new U.S. passport or when you are replacing an expired U.S. passport that was issued to child under the age of sixteen; Or for a lost passport.
The document number is the passport number, which can be but not necessarily include alphabets. It commonly consists of between six and nine alphanumeric characters, meaning it can be made up of numbers, letters or a combination of both. The passport number is often used as a form of personal identification and is valid in countries which recognise the document. As such, this document number can be used to confirm your identity, your citizenship and your immigration status.