Key

A  is an object given to House Guests in Big Brother. Before the game starts, keys are given to House Guests who have applied and successfully been accepted into the game and are mailed to them. After entering the Big Brother house, keys are given a more powerful and pivotal role in the game. The following ways are a few that Keys are used in the game:
 * Keys are given to the current Head of Household in order to unlock their HOH Bedroom.
 * Keys are given out at Nomination Ceremonies. If a House Guest pulls a key with their name on it they are safe. The two House Guests not given keys are then put up on the block for Eviction.
 * Keys have also been frequently used during Endurance Competitions and contestants are prompted to hold onto their keys for as long as possible.
 * Keys are also given to jury members with both names of the finalists written on them. The jury member then walks up to a Nomination Box and places the key in it, where they are pulled one by one.

In "Big Brother 13" a new special kind of key was given out called the Golden Key. These keys were given out to whichever member of a duo survived Eviction. These House Guests could not be nominated or play in competitions until the Final 10, but could still cast Eviction votes.