Beard Scanners are security access panels that are found at the entryways of various rooms and buildings. The scanners will grant you access if the player is wearing one of the correct beards. It scans the players face and grants or denies access accordingly. Some access is granted based on a list of beards, but only one is required to open - you do not need all of the beards.
List of Scanner
This is a list of scanners in the game, and the beards required to open them.