Cyber-helmet

Cyber-helmet was a term used, by the Sixth Doctor at least, to refer to the head of a Cyberman's cyber-suit. (AUDIO: The Carrionite Curse) Bates refered to it as a Cyber-head. (TV: Attack of the Cybermen)

The Sixth Doctor kept a Cyber-helmet in his C chest. (AUDIO: The Carrionite Curse)

The Ninth Doctor, accompanied by Rose Tyler, found that a Cyber-helmet was among the exhibits on display within Henry van Statten's vault in 2012. (TV: Dalek) Years later, Adam Mitchell used the Cyber-helmet to send out a sub-ether signal in order to lure out a Time Agent. (COMIC: Mystery Date)

In the case of the Cybermen from Pete's World, the brain their helmets contained was the sole organic component that remained in a Cyberman. (TV: Rise of the Cybermen/The Age of Steel)

Partially converted during the Battle of Canary Wharf, Lisa Hallett's head was supported by an incomplete Cyber-helmet. Following a failed conversion which resulted in his death, parts of a Cyber-helmet's face were seen embedded into that of Dr Tanizaki. (TV: Cyberwoman)

Lesser Cyberslaves appeared as metallic humanoids with Cyber-helmets. (GAME: Blood of the Cybermen)

Despite being detached from its body, the helmet of a damaged and automated Cyberman suit made a failed attempt to replace its expired organic components by assimilating Amy Pond. To that end, the Cyber-helmet opened up and empited itself of a humanoid skull by closing back again and firing a dart at Amy's neck, which rendered her unconscious. (TV: The Pandorica Opens)

Having been stripped of its organic components, a Cyber-helmet named Handles was claimed by the Eleventh Doctor at the Maldovar Market. Having a cybernetic mind of his own, Handles would serve as a companion just prior to and during the early centuries of the Siege of Trenzalore. (TV: The Time of the Doctor)

In the 2010s, Kate Stewart presented a severed Cyber-helmet from one of their prior Earth invasions to a group of Cybermen created by. (TV: Death in Heaven)