| 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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