Curious case of Indrani Mukherjee and Permanent Account Number

Permanent account number” means a number which the Assessing Officer may allot to any person for the purpose of identification and includes a permanent account number having ten alphanumeric characters and issued in the form of a laminated card. [Form 49A].

The card has 3 information with signature
1. Name
2. Father's Name
3. Date of Birth
4. Signature