The custodian helmet is a type of helmet worn predominantly by male police officers in the United Kingdom, within England and Wales, and certain other places around the world. First used by the Metropolitan Police in London in 1863, the BBC labelled the custodian helmet a "symbol of British law enforcement". They are worn by male constables and sergeants on foot patrol—the expression "Bobby (slang term for policeman, after policing founder Sir Robert Peel) on the beat" derives from this. A cultural icon, it has featured in films, TV series and other media involving British police.
