SIL linguist successfully proposes new phonetic symbol The council of the International Phonetic Association has approved the adoption of the first new symbol in twelve years into the International Phonetic Alphabet. The symbol proposed by SIL represents the labiodental flap, a speech sound found in central and southeastern Africa. The IPA is the organization that sets the standards for the transcription of speech sounds in the world’s languages. Read more about SIL linguist successfully proposes new phonetic symbol