TPIN stands for "Transaction PIN" and is a four-digit password used for authentication when performing transactions in Punjab National Bank (PNB) . It is different from the ATM PIN and is used specifically for phone banking services. To set or reset the TPIN in PNB, one needs to follow the prescribed procedure, which may vary depending on the platform used. For example, in the PNB One app, one can change the TPIN under the "MY PROFILE" section. In case of any issues or queries related to TPIN, one can contact the IT department of PNB or the customer support of the respective platform.