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HI The standard two letter abbreviation for the state of Hawaii is HI.
Credit: Glowimages Glowimages Getty Images. According to the University of Hawaii, the letters in the 12-letter Hawaiian alphabet are A, E, H, I, K, L, M, N, O, P, U and W. Correct orthography is important for understanding the written Hawaiian language, as subtle differences between similarly spelled words can be designated with specific marks.