Hunminjeongeum · Sejong's Preface

ㅂ Beu-iB(브입)[p] is a lip sound, corresponding to the
         initial sound of 볃 Byeot meaning To Twist. ㅃ(PPeu-
         iPP)[p͈ ] is formed by writing two ㅂ side by side. It
         corresponds to the initial sound of 뽀 PPo meaning
         Step.
    ㅍ Peu-iP(프잎)[pʰ] is a lip sound, corresponding to the
         initial sound of 표 Pyo meaning To Drift.
    ㅁ Meu-iM(므임)[m] is a lip sound, corresponding to the
         initial sound of 미 Mi meaning Maitreya.

    ㅈ Jeu-iJ(즈잊)[tɕ] is an teeth sound, corresponding to the
         initial sound of 즉 Jeuk meaning Immediately. ㅉ
         (JJeu-iJJ)[tɕ͈] is formed by writing two ㅈ side by side.
         It corresponds to the initial sound of  [tɕ͈ʌ] meaning
         Love.
    ㅊ Cheu-iCh(츠잋)[tɕʰ] is an teeth sound, corresponding
         to the initial sound of 침 Chim meaning To Invade.
    ㅅ Seu-iS(스잇)[s] is an teeth sound, corresponding to
         the initial sound of 슏 Syut meaning Dog. ㅆ(SSeu-
         iSS)[s͈ ] is formed by writing two ㅅ side by side. It
         corresponds to the initial sound of 쌰 SSya meaning
         Wicked.

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