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 referred to it as a Cyber-head. (TV: Attack of the Cybermen)

Variants
Cybermen were typically recognised by the distinctive side handles located atop their helmets. (TV: The Tenth Planet, The Age of Steel, The Time of the Doctor) In the case of the Mondasian Cybermen, the handles were a attachable headset which functioned as an emotional inhibitor, which was lacked by the first Mondasian patients. (TV: World Enough and Time) Conversely, the emotional inhibitors of the Cybermen from Pete's World were located within their chests. (TV: The Age of Steel)

In Pete's World, EarPods worn by humans that had yet to be upgraded could be used by Cybus Industries to access their knowledge. During this process, in which the oblivious subject was incapacitated, similar handles would form and connect from the two EarPods. (TV: Rise of the Cybermen)

Cyber-Controllers, such as the one who resided on Telos, were distinguished from their subordinates in that their helmets sported an enlarged cranium which forgone the handles. (TV: The Tomb of the Cybermen, Attack of the Cybermen) Conversely, John Lumic, the Cyber-Controller of Pete's World, had a Cyber-helmet with handles. He was distinguished by his brain which was visible behind the forehead's casing, and a set of four blue lights in each eye. (TV: The Age of Steel)

In both N-Space and Pete's World, Cyber-Leaders were typically distinguished by their black handle bars. (TV: Earthshock, Army of Ghosts) The leader of the CyberNomads had a black helmet with only a silver faceplate. (TV: Revenge of the Cybermen) Certain Cyber-Leaders, also designated Cyber-Lords, had black facial plating with visible brains. (TV: The Next Doctor, A Good Man Goes to War, GAME: Blood of the Cybermen)

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

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)

Cyberdogs were supported by canine Cyber-heads. (COMIC: Enemy Mine)

Cybershades had bronze Cyber-heads. Like their Cyberman superiors, they had piping like handlebars connected to their heads, except they angled diagonally like the ears of an animal. (TV: The Next Doctor)

Uniquely, Cybermen whom participated in an alternate Last Great Time War had helmets whose side handles pointed down rather than upwards. (COMIC: Prologue: The War Doctor)

Individual cases
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)

Partially converted during the Battle of Canary Wharf, Lisa Hallett's head was supported by an incomplete Cyber-helmet without facial plating. 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)

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 faceplate split in two, emptying the helmet of a humanoid skull. As it attempted to assimilate Amy, the helmet repeatedly opened and closed before it eventually fired a dart at Amy's neck, which rendered her unconscious. Ultimately, however, the Cyber-suit was neutralised by Rory Williams. (TV: The Pandorica Opens)

After it had been stripped of its organic components, a Cyber-helmet named Handles, which sported some damage to its faceplate. 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)