PIN; personal identification number; password number
A numeric code used for authentication, especially at ATMs, credit card transactions, and device unlocking. Often simply called 暗証番号 or PIN.
ATMで暗証番号を入力してください。
Please enter your PIN at the ATM.
スマホの暗証番号を忘れてしまった。
I forgot my smartphone's passcode.
Please enter your PIN at the ATM.
I forgot my card's PIN.
I set a PIN for my new smartphone.
I changed my PIN at the bank counter.