Hubble telescope is described as the largest orbiting telescope built. It sends back pictures and is extremely important to deep space research.

Humidifier is identified as either a free standing unit or a component of a central heating/cooling system that adds moisture to the air before it is distributed throughout the house.

Homogenous products is identified as products that are similar in quality, but different in price and require comparisons.

High capacity aircraft is described as a kind of aircraft which is equivalent to wide-bodied aircraft. These aircrafts are referring to: B747, B767, B777, A300, A310, A330, A340, DC10, MD-11, L-1011, IL-86 and IL-96.

Head, in sailing or power boating term may refer to:

1. The bow

High-density polyethylene (HDPE) is described as a rigid, tough and strong resin of natural milky color.

Hopper refers to a device for temporarily storing dust collected by an air pollution control device.

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