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HI The standard two letter abbreviation for the state of Hawaii is HI.
1 Hawaii is the only state in the union where coffee is grown. 2  More than 1/3rd of the worldâs supply of pineapples comes from Hawaii. 3  There are only 12 letters in the Hawaiian alphabet: 4  Vowels: A, E, I, O, U; Consonants: H, K, L, M, N, P, W.  Hawaii is the widest state from east to west.