| Hand Truck | Refers to a type of fork truck that is powered but does not carry an operator. Often referred to as a walk-behind fork truck. |
| Hazardous Materials (hazmat) | A useable item or material that because of its physical and/or chemical nature contains any of the characteristics that are 'hazardous', such as: ignitable, corrosive, reactive, toxic, or is a strong oxidizer or strong reducer. |
| Headmount Display | A wearable device that is positioned in front of a user's eyes and projects a viewable image of a computer screen and any applications running. |
| Honeycombing | Refers to the unused pallet positions in high-density storage that result when the number of unit-loads for an item does not completely fill the storage lane. Since mixing items in high-density storage is normally not done, these unused pallet positions are not available to store other materials. |
| HTTP | Hypertext Transfer Protocol is the communication protocol used for exchanging files (text, graphic images, sound, video, and other multimedia files) on LANs, MANs, and WANs - such as the Internet. HTTP handles all communication between web servers and web browsers (clients).
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