The military calls it the Emergency Passenger Oxygen System or EPOS. This is often seen on aircraft in a green pouch.
The private airline industry refers to the unit as a SCU or Self Contained Unit.
The commercial airline induct uses the SCU/VRU/EPOS big brother called the PBE. These are used on over 90% of commercial flights around he world.
The manufacturer, Essex Industries calls it a Victim Rescue Unit Plus or VRU+ for government and public safety use.
The VRU Escape Hood you can order here, while slightly different in outward appearance, is one and the same.