Indeed BNP Paris does that for the Pin number, so it's only numbers you have to type.

It has been there or a long time, so I kinda consider it a remnant of the old battle against keylogger, since the number position changes. It does seem outdated now, and I'm unsure if it's still useful compared to all the other possible checks they could implement.

It's not my PIN number, it's used as a password to access on-line banking services. But I agree that it look like it's design to defend against keylogger; I don't know how efficient it is.