Key

A Key is an object given to houseguests in Big Brother. Before the game starts, keys are given to houseguests, that means that they are entering the Big Brother House. 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:

- The HOH earns himself / herself a key, which is usually different from the other keys, it represents the power of the Head of Household.

-  Keys are given out at Nomination Ceremonies  If a Houseguest pulls a key with their name on it they are safe. The two Houseguests not given keys are then put up on the block for Eviction.

- In Big Brother 4 immunity keys were introduced,  These keys were given out to whichever member of a duo survived eviction. These houseguests could not be nominated or play in competitions until the Final 6, but could still cast eviction votes.