Horizon, ECS - Travis's family's ship was the Horizon. In 23 years Mayweather's folks experienced problems no more than about a half a dozen times, but they were never out as far as Enterprise (2 weeks at warp 5 or less). (Fight or Flight)
Hull plating - The primary defensive system aboard Enterprise. The ship's hull plating can be polarized to absorb and redirect energy. This polarization process could be the forerunner of the Structural Integrity Field. (Broken Bow)
Human - An intelligent species native to Earth. Humans have only recently entered the interstellar community with the advent of a warp 5 engine. (Broken Bow)
"Humanoid figure" - "Humanoid figure" is the name given in the credits for this mysterious participant in a temporal cold war. He originates from the future. The "Humanoid figure" commands Silik and the Suliban Kabal to act as soldiers on this 22nd century front of the temporal cold war. He is played by James Horan. (Broken Bow) According to Daniels, the "humanoid figure" comes from an earlier time than his (the 31st century) when time travel was not yet perfected. All that can be said with reasonable certainty is that the figure seems to come from somewhere between the 24th and 31st centuries.
Hydroponics - A source of food aboard freighters when supplies of "fresh" food runs low. (Fortunate Son)