The Physioalphabet, Human Physiological Alphabet, or HPA, is a proposed featural writing system created by Geoffrey Tudor in 1994 based on the human physiology utilized to produce speech. Design Goals According to the official Physioalphabet website,<ref name=":0" /> HPA was created to "describe the most important features of the alphabet," which are listed as following: # HPA applies only to human beings. # HPA originates from human anatomy and physiology. # HPA’s system is an alphabet, not some other notation system. Features HPA permits the expression of a wide variety of phonetic features, including consonants and vowels. The consonant types supported with the HPA are plosives, nasals, trills, taps/flaps, fricatives, and approximants.
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