Duress PIN/Password GrapheneOS provides users with the ability to set a duress PIN/Password that will irreversibly wipe the device (along with any installed eSIMs) once entered anywhere where the device credentials are requested (on the lockscreen, along with any such prompt in the OS).

The wipe does not require a reboot and cannot be interrupted. It can be set up at Settings > Security & privacy > Device unlock > Duress Password in the owner profile. Duress PIN is solely used for PIN entry and duress password is solely used for password entry. Both a duress PIN and password are mandatory to enable the feature to account for different profiles that may have different unlock methods. Duress PIN will also wipe the device when entered as the two-factor fingerprint unlock PIN but not currently when entered as the SIM PIN.

Note that if the duress PIN/Password is the same as the actual unlock method, the actual unlock method always takes precedence, and therefore no wipe will occur.

Copy-pasted from GOS wiki