How the Vowels Were Designed: Heaven, Earth and Human
See how all Korean vowels were built from three simple symbols: a dot for heaven, a flat line for earth and a standing line for human.
Professor Hangyeol · The history, culture and advanced expressions of HangeulWhat you will learn in this lesson
- Name the three basic vowel symbols ·, ㅡ and ㅣ and what they stand for
- Explain how ㅗ ㅏ ㅜ ㅓ and ㅛ ㅑ ㅠ ㅕ were built from them
- Understand 'bright' and 'dark' vowels and how they appear in Korean words
- Learn words such as 하늘, 땅, 사람 and 모음
Good day, my friend! Last time we looked inside the mouth. Today, let us look up at the sky, down at the ground, and then at ourselves. Long ago, King Sejong found the vowels there.
A different idea for vowels
For the consonants, King Sejong drew pictures of the speech organs. For the vowels, he used another idea. Vowels are made with an open mouth, so it is hard to draw a clear 'shape' for them. Instead, the vowels were built from three simple symbols that stand for the three basic parts of the world in East Asian thought: heaven, earth and human.
In Korean, these are 하늘 (sky, heaven), 땅 (earth, ground) and 사람 (person, human). In the old philosophy, these three together make up everything in the world. The vowels of Hangul were designed to reflect this harmony.
Words for this lesson
- 모음 moeum vowel
- 하늘 haneul sky, heaven
- 땅 ttang earth, ground, land
- 사람 saram person, human
- 점 jeom dot, point
- 아래아 araea the name of the old dot vowel ㆍ
Three simple symbols
The book 훈민정음, published in 1446, explains the three basic vowel symbols like this.
The dot · is round, like the sky. It stands for heaven.
The flat line ㅡ lies level, like the ground. It stands for earth.
The standing line ㅣ stands straight up, like a person standing between heaven and earth. It stands for human.
The book also connects the three to the way they are pronounced. For example, for · the tongue pulls back and the sound is deep. For ㅣ the tongue does not pull back and the sound is shallow. For ㅡ it is in between. You do not need to remember these details, but they show how carefully the system was thought out.
The three basic vowel symbols
| Symbol | Stands for | Shape | Korean word |
|---|---|---|---|
| ㆍ | heaven | round like the sky | 하늘 |
| ㅡ | earth | flat like the ground | 땅 |
| ㅣ | human | standing like a person | 사람 |
In Korean, heaven, earth and human are often called 천지인 (天地人).
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Stand up straight for a moment. Yes, like that! Now you are the ㅣ, standing between the sky and the ground. I like to think that King Sejong wanted every person to see themselves inside the alphabet.
Putting the pieces together
Now comes the clever part. All the other vowels were made by combining the three symbols.
Put the dot above the flat line, and you get ㅗ. Put the dot below the flat line, and you get ㅜ. Put the dot on the right of the standing line, and you get ㅏ. Put the dot on the left of the standing line, and you get ㅓ.
Then, use two dots instead of one, and you get ㅛ, ㅠ, ㅑ and ㅕ. These vowels start with a short 'y' sound: ㅑ is like 'ya', ㅕ is like 'yeo', and so on.
In the 15th century, the dots were really written as round dots. Over time, for easier and faster writing, they became the short strokes that you see today. So the little stroke in ㅏ was once the 'heaven' dot.
Building vowels step by step
- ㆍ + ㅡ → ㅗ Heaven above the earth: the dot goes on top. As in 오이 (cucumber).
- ㅡ + ㆍ → ㅜ Heaven below the earth: the dot goes underneath. As in 우유 (milk).
- ㅣ + ㆍ → ㅏ The dot on the right side of the person. As in 아이 (child).
- ㆍ + ㅣ → ㅓ The dot on the left side of the person. As in 어머니 (mother).
- ㅗ → ㅛ Two dots instead of one add a 'y' sound at the start. As in 요리 (cooking).
- ㅏ → ㅑ Two dots on the right side. As in 야구 (baseball).
The eleven vowels of 1446
| Group | Vowels | How they were made |
|---|---|---|
| Basic symbols | ㆍ ㅡ ㅣ | Heaven, earth and human |
| One dot added | ㅗ ㅏ ㅜ ㅓ | One dot combined with ㅡ or ㅣ |
| Two dots added | ㅛ ㅑ ㅠ ㅕ | Two dots, adding a 'y' sound |
17 consonants + 11 vowels = the 28 original letters.
Bright vowels and dark vowels
The position of the dot was not random. In the old philosophy of yin and yang (음양), everything has a bright, warm side and a dark, cool side.
Vowels with the dot up or outward, such as ㅗ and ㅏ, were considered bright (yang). They are often called 양성 모음 in Korean. Vowels with the dot down or inward, such as ㅜ and ㅓ, were considered dark (yin). They are called 음성 모음. The vowel ㅣ was treated as neutral.
This is not just philosophy. You can still feel it in modern Korean. Bright vowels often give a small, light, cute feeling. Dark vowels often give a big, heavy, deep feeling. Koreans tend to keep bright vowels together and dark vowels together in the same word. This is called vowel harmony, or 모음조화.
Feel the difference: bright vs dark
- 졸졸 joljol trickling (a small stream of water) Bright ㅗ: a little, gentle flow.
- 줄줄 juljul streaming, pouring (a lot of water or tears) Dark ㅜ: a bigger, heavier flow.
- 반짝반짝 banjjakbanjjak twinkling, sparkling Bright ㅏ: small, light flashes, like little stars.
- 번쩍번쩍 beonjjeokbeonjjeok flashing brightly Dark ㅓ: big, strong flashes, like lightning.
- 퐁당 pongdang plop (a small thing falling into water) Bright ㅗ and ㅏ.
- 풍덩 pungdeong splash (a big thing falling into water) Dark ㅜ and ㅓ.
Vowel harmony in grammar
When you learn the polite present tense, you will meet this again. Verbs whose last vowel is ㅏ or ㅗ usually take -아요, while most others take -어요. For example, 잡다 (to catch) becomes 잡아요, but 먹다 (to eat) becomes 먹어요. This is a living echo of the bright and dark vowels that King Sejong described more than 500 years ago.
What happened to the dot?
The dot vowel ㆍ is called 아래아 in Korean. Over the centuries, its sound slowly changed and merged with other vowels in standard speech. In the 1930s, it was dropped from the standard spelling. So today, ㆍ is one of the four original letters that are no longer used.
But the dot did not really disappear. It lives on as the short stroke inside ㅏ, ㅓ, ㅗ, ㅜ and the others. And on some mobile phones, a popular Korean keyboard has only three vowel keys: ㆍ, ㅡ and ㅣ. You type ㅏ by pressing ㅣ and then ㆍ, just as King Sejong designed it.
When my granddaughter showed me that phone keyboard, I laughed with joy. She types faster than I can talk, and she is using King Sejong's heaven, earth and human every single day.
Check quiz
Q1. What does the dot ㆍ stand for?
Q2. What does the standing line ㅣ stand for?
Q3. Which vowel is made by putting the dot above ㅡ?
Q4. Which vowel is made by putting the dot on the left of ㅣ?
Q5. Which word sounds smaller and lighter?
Q6. How many vowels were in the original 훈민정음?
Beautiful work today. Heaven, earth and human: three little symbols, and from them, all the vowels. Next time, I will tell you about a precious old book that was hidden for centuries and found again. Until then, take care.
Key points
- The vowels were built from three symbols: ㆍ heaven (하늘), ㅡ earth (땅), ㅣ human (사람).
- Combining one dot with ㅡ or ㅣ made ㅗ ㅏ ㅜ ㅓ; two dots made ㅛ ㅑ ㅠ ㅕ.
- The original system had 11 vowels; the dots later became short strokes.
- Bright vowels (ㅗ, ㅏ) and dark vowels (ㅜ, ㅓ) still shape Korean words through vowel harmony (모음조화).
- The dot vowel ㆍ (아래아) is no longer used, but it lives on in the strokes and in a phone keyboard.
Recommended official free resources
- National Hangeul Museum — National Hangeul Museum
- Korean Basic Dictionary (multilingual) — National Institute of Korean Language
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