A<unk>  (head and neck support<unk>  is a type of head restraint, a safety<unk>  in motorsports. Head restraints are mandatory when competing with most major motorsports sanctioning bodies. They reduce the likelihood of head or neck injuries, including the often fatal basilar skull fracture, in the event of a crash. There are many such<unk> s on the market today, but the<unk>  is the original and the most common.
HANS device
Odon device
Toftness device
Bag valve mask
Bifocals
Hug machine
Dental dam
Papoose board