How Hangul Was Created: Mouth Shapes, Strokes and Vowels

How Hangul Was Created in One Sentence

Hangul was created as a system, not as a list: King Sejong's 1443 alphabet starts from five consonant shapes that picture the mouth and three vowel elements that picture heaven, earth and human, then derives every other letter by adding strokes or combining elements.

The original design had 28 letters: 17 consonants and 11 vowels. The design is documented in the Jejahae (제자해, "explanation of the design of the letters"), a section of the Hunminjeongeum Haerye (훈민정음 해례본) published in 1446 by scholars of King Sejong's court. Very few scripts in the world have a surviving explanation of their design from the time they were made.

This lesson belongs to our Hangul history overview. To see why a system was needed at all, start with the problem it solved.

Why Did Hangul Need a New Design?

Hangul needed a new design because the existing writing system, Chinese characters, required years of study and did not fit Korean grammar. Sejong's preface to the Hunminjeongeum says the people's speech differed from that of China and that many people had things they wished to say but could not put into writing.

A writing system for everyone had to meet three goals:

• Few symbols: a farmer could not learn thousands of characters, but could learn a few dozen letters.
• Sound-based: each letter had to stand for a sound, so any Korean word could be written.
• Learnable logic: letters that share features should look alike, so learning one letter helps with the next.

The third goal is where Hangul differs from most alphabets. In English, the shapes of B and P tell you nothing about their sounds, even though both are made with the lips. In Hangul, ㅂ and ㅍ share a visible base because they share a place in the mouth. That logic begins with five basic consonants.

The Five Basic Consonant Shapes

The Haerye names five basic consonants, one for each place in the mouth where Korean consonants are made, and says each letter pictures the organ at work:

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What Does ㄱ Show?

ㄱ shows the back of the tongue rising to block the airway, seen from the left side of the head. Say "go" slowly and feel the back of your tongue press against the soft roof of your mouth: the corner of ㄱ is that raised tongue root. The Haerye's description, in Classical Chinese, is 象舌根閉喉之形, "it pictures the tongue root closing the throat".

What Do ㄴ, ㅁ, ㅅ and ㅇ Show?

The other four basic letters show the same kind of side or front view:

• ㄴ: the tongue tip curving up to touch the ridge behind the upper teeth. Say "no" and notice where your tongue tip lands.
• ㅁ: the closed mouth, seen from the front as a square. Say "ma" and feel both lips press together.
• ㅅ: a tooth, the point where air hisses past the teeth. Say "sa" and feel the air stream on your teeth.
• ㅇ: the open throat, drawn as a circle. The Haerye classed its sound as a throat sound.

You can practise each shape with the Interactive Hangul Alphabet, which plays the sound and shows the strokes when you tap a letter. With five shapes in place, the next step builds the rest of the consonants.

Adding Strokes for Stronger Sounds

Hangul adds a stroke to a basic letter to show a stronger version of the same sound, a principle the Haerye calls 가획 (gahoek, "adding strokes"). "Stronger" here means more forceful or with more breath: ㅋ is ㄱ with a puff of air, and the extra stroke records that puff. These breathy consonants are called aspirated consonants.

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Look at each row and you can see the strokes pile up. ㄴ gains a top line to become ㄷ, then a middle line to become ㅌ. ㅅ gains a top bar to become ㅈ, then a tick to become ㅊ. The row for ㅁ is slightly different: ㅂ is ㅁ with two short upward strokes, and ㅍ rearranges its strokes into a wider shape, but the Haerye still treats both as added-stroke forms of ㅁ.

Expert insight: the families are the fastest memory aid for beginners. If you know ㄱ, ㄴ, ㅁ, ㅅ and ㅇ, you already know the base of 14 of the modern consonants, and the remaining shapes follow from "more strokes, more force". Our Hangul mnemonics use these real shapes instead of invented pictures.

Which Letters Do Not Follow the Rule?

Three of the original 17 consonants break the stroke rule. The Haerye calls them 이체자 (iche-ja, "letters of different form"): ㆁ, ㄹ and ㅿ. They are based on a basic shape but do not mean "stronger".

• ㆁ (the old "ng"): drawn from ㅇ with a small stroke on top, because its sound was felt to be close to the throat sounds, not because it was stronger. It later merged into ㅇ.
• ㄹ (r/l): related to the tongue-tip letters ㄴ and ㄷ, but its extra strokes show a different manner of sound (a liquid), not more force.
• ㅿ (a soft z-like sound): related to ㅅ, but voiced and weaker, not stronger. It later disappeared.

Two of these three are now gone. You can read about them among the letters that later disappeared. The consonant system is complete; the vowels use a different idea entirely.

Heaven, Earth and Human: the Vowel Design

Hangul vowels are built from three basic elements, which the Haerye links to the three forces of the world in Neo-Confucian thought (천지인, cheon-ji-in):

The dot was also a vowel letter of its own, called arae-a (아래아). It is one of the four letters no longer used in modern standard Korean.

How Do the Elements Combine into ㅏ, ㅗ and ㅜ?

The other vowels are made by placing the heaven dot next to the earth line or the human line. The side on which the dot sits mattered in the original design:

• Dot above earth → ㅗ; dot below earth → ㅜ.
• Dot to the right of human → ㅏ; dot to the left of human → ㅓ.
• Two dots → ㅛ, ㅠ, ㅑ, ㅕ, the y-vowels, which add a "y" glide.

Vowels with the dot above or outside (ㅗ, ㅏ) were classed as yang, "bright"; vowels with the dot below or inside (ㅜ, ㅓ) as yin, "dark". This classification still matters in grammar today, where verb endings choose between 아 and 어 forms by the same split. The heaven-earth idea also explains bright and dark vowels. In modern printing the dot is drawn as a short stroke, so ㅏ shows a line where a dot used to be. With consonants and vowels both in hand, you can build a real word.

Worked Example: Building 한글 from the Design

This worked example rebuilds the word 한글 (Hangeul, "Hangul") using only the design principles.

Block 1: 한 (han)

1. ㅎ: start from the throat letter ㅇ; add strokes for a stronger, breathy throat sound. The Haerye's path is ㅇ → ㆆ → ㅎ.
2. ㅏ: take the human line ㅣ and put the heaven dot on its right side, the bright position.
3. ㄴ: the tongue-tip letter, picturing the tongue touching the ridge. Placed at the bottom, it is the final consonant.

Block 2: 글 (geul)

1. ㄱ: the tongue-root letter, picturing the back of the tongue blocking the throat.
2. ㅡ: the earth line on its own, a vowel with no dot.
3. ㄹ: one of the irregular letters, related to the tongue-tip family. At the bottom it is the final consonant.

Notice step 3 in both blocks: final consonants use the same letters as initial consonants. The Haerye states this rule as 종성부용초성 (jongseongbuyongchoseong, "final sounds reuse the initial letters"). One set of consonant letters therefore serves both positions, which keeps the alphabet small.

The block shape itself comes from a third principle: the Haerye divides every syllable into three parts, the initial sound (초성, choseong), the middle sound (중성, jungseong) and the final sound (종성, jongseong). Chinese phonology of the time split syllables into only two parts, an initial and a rhyme. Sejong's scholars separated the vowel from the final consonant, which is exactly what lets Hangul write any Korean syllable with a small set of letters stacked into one block. Modern linguists call these parts the onset, nucleus and coda. The design idea that ties all of this together has a technical name.

Common Misconceptions about Hangul's Design

Four misconceptions about Hangul's design appear often in popular explanations.

1. Learners often assume every consonant pictures the mouth; actually only five do. The other letters are derived from those five by strokes or are irregular forms, because the system was built to be economical.
2. Learners often assume the vowels picture the mouth too; actually they are philosophical symbols, heaven, earth and human, combined by rules. Only the consonants are articulatory pictures.
3. Learners often assume the design was copied from another script; actually this is contested. An entry in the royal annals for the 12th month of 1443 says the letters "imitate the old seal characters", and some scholars, notably Gari Ledyard, argue that a few shapes were influenced by the 'Phags-pa script of the Mongol Yuan dynasty. Many Korean scholars reject that view and stress the Haerye's own articulatory explanation. Both positions use the same sources; the system of strokes and features is undisputedly original.
4. Learners often assume 15th-century descriptions match modern phonetics exactly; actually some do not. The Haerye groups ㅇ and ㆁ by its own sound categories, and calls ㄱ a "molar" sound where modern phonetics says velar. The descriptions are accurate pictures of the mouth, but the categories come from Chinese phonology of the time.

This is why Hangul is called a featural alphabet: letter shapes encode features such as place in the mouth and breathiness, not just single sounds. Now test your understanding.

Practice: Predict the Letter

Use the design rules to answer each question. Answers follow below.

1. ㅂ is the lip letter with one level of added strokes. Which letter is the breathy (aspirated) lip sound?
2. Which basic letter is the base of ㅈ and ㅊ, and which mouth part does it picture?
3. Put the heaven dot to the left of the human line. Which vowel do you get, and is it bright or dark?
4. Which of these letters does not follow the "more strokes = stronger" rule: ㅌ, ㄹ, ㅋ?

Answers to the Practice

1. ㅍ. The lip family runs ㅁ → ㅂ → ㅍ; the last step adds breath.
2. ㅅ, which pictures a tooth. ㅈ adds a top bar and ㅊ adds a tick.
3. ㅓ, a dark (yin) vowel, because the dot sits on the inside.
4. ㄹ. It is one of the three irregular letters; ㅌ and ㅋ are regular added-stroke letters.

If you answered all four, you can rebuild most of the consonant chart from five shapes.

What to Learn Next

Now learn the Korean consonants one by one; each letter lesson repeats the mouth position you learned here. Explore each letter with the interactive practice tools, which let you hear and build blocks.

• Back to the overview: the Hangul history overview places this design in its timeline.
• Next in history: the dot vowel ㆍ was one of the letters that later disappeared.

What this lesson does not cover: the political story of the invention, the full list of 15th-century letters and sound values, and the double-letter spellings of Middle Korean. Those topics sit on the other history pages. How Hangul was created remains the best-documented part of the story, because the Haerye explains it in the creators' own words.

Frequently Asked Questions

Did Sejong study other alphabets?

Sejong's court knew several scripts, including Chinese characters and the 'Phags-pa script of the Mongol Yuan dynasty, and his scholars studied Chinese phonology closely. A court record from 1443–1444 says the letters "imitate the old seal characters". Some scholars, notably Gari Ledyard, argue that a few letter shapes came from 'Phags-pa; others reject this. The question remains open.

Why does ㅇ look like a circle?

According to the Haerye, ㅇ pictures the shape of the throat, because its sound was classed as a throat sound. In modern Korean ㅇ has two jobs: it is silent at the start of a syllable and sounds "ng" at the end. The "ng" job once belonged to a separate letter, ㆁ, which later merged into ㅇ.

Are double consonants part of the original design?

Yes, as a writing method rather than as separate basic letters. The Hunminjeongeum describes writing two identical letters side by side, such as ㄲ and ㅆ, for a different class of sounds. They were not counted among the 28 letters. Modern Korean uses five of them for its tense consonants: ㄲ, ㄸ, ㅃ, ㅆ and ㅉ.

Is the design explained in the original book?

Yes. The 1446 Hunminjeongeum Haerye ("explanations and examples") contains a section called Jejahae, "explanation of the design of the letters", which describes the mouth-shape consonants, the stroke additions and the heaven-earth-human vowels. This is why Hangul's design is documented rather than reconstructed. The book was rediscovered in 1940.