<unk>  is a medical term describing the condition of a person who has been subjected to multiple traumatic injuries, such as a serious head injury AND a serious burn.
The term has become common among US military doctors in describing the seriously injured soldiers returning from Operation Iraqi Freedom (Iraq) and Operation Enduring Freedom (Afghanistan). The term however is generic, and has been in use for a long time for any case involving multiple traumata.
Polytrauma
Near drowning
Anoxic brain injury
Barotrauma
Penetrating head injury
Blast injury
Traumatic brain injury
Spinal shock