Anonymity

Anonymous emblem
Anonymity means "namelessness" and comes from Greek words meaning "without name". It is when a person's identity or name is unknown. If a person is called anonymous, nobody knows who he or she is, or the anonymous person does not want to be found out.
Protest by an Internet group calling itself 'Anonymous' against the practices and tax status of the Church of Scientology.
The concept of anonymity has some important uses. It is vital for a democracy that votes cast in an election are anonymous. In that way, no-one can find out how a person voted in an election.
Anonymity Media
Protesters outside a Scientology center on February 10, 2008, donning masks, scarves, hoods, and sunglasses to obscure their faces, and gloves and long sleeves to protect them from leaving fingerprints.
Modern pasquinades glued to the base of Pasquino, one of the Talking Statues of Rome