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Four-H club an organization in the U.S. that teaches young people about farming and how to take care of a home. Four-H clubs are so named because they are meant to improve the heads, hearts, hands, and health of their members.
H-bomb a very powerful bomb that releases energy by nuclear fusion. "H-bomb" is short for hydrogen bomb.
H.G. Wells British author and social critic, born Herman George Wells, celebrated for developing the genre of science fiction.
H.S. abbreviation of "High School," a school consisting of grades nine or ten through twelve or, formerly, grades seven through twelve (used in a proper name).
NH an abbreviation for New Hampshire.