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The purpose of this paper is to examine how Korean Sign Language (KSL) and Korean Braille are formed and function as complete languages under conditions of hearing loss and visual impairment. KSL and Korean Braille are efficient and rational language systems formed to make use of other sensory organs under conditions of auditory or visual impairment. KSL and Korean Braille are creative languages respectively employing visual and tactile systems, providing complete new language systems under limited conditions. At the same time, they are popularly identified with the socioeconomically disadvantaged status of hearing or visually impaired people. Accordingly, this study examined the formation and function of KSL and Korean Braille characters, revealing their linguistic value. KSL was found to possess roots in Korean culture, while Korean Braille is characterized by simple principles of base point and left/right and up/down symmetry based in the Hangeul writing system. Comparison of KSL with spoken Korean, Hangeul, and Korean Braille showed KSL and Korean Braille to exhibit superior language functions while using simple principles.