Hangul Filler U+3164

The Hangul Filler (U+3164) is a Korean character that acts as a placeholder in the Hangul writing system. What makes it remarkable is a quirk of how Unicode classifies it: despite being completely invisible, it is categorized as a letter, not as whitespace.

This single classification difference is why Hangul Filler works where other invisible characters fail. Games, social platforms, and apps that aggressively strip spaces, zero-width characters, and other whitespace often still preserve Hangul Filler because their filters check for whitespace, and Hangul Filler is not whitespace. It is a letter. An invisible letter.

This makes it a popular choice for invisible names in Among Us, blank tweets on Twitter/X, and empty usernames on any platform that requires "at least one non-whitespace character."

How to Get an Invisible Name in Among Us

This is the most common use of Hangul Filler. Here is how to do it step by step:

1. Copy the character. Click the copy button at the top of this page to copy the Hangul Filler (U+3164) to your clipboard.
2. Open Among Us. Launch the game on PC, mobile, or console.
3. Go to name settings. Click on your player name at the top of the screen or in the settings menu.
4. Clear your current name. Delete your existing name entirely.
5. Paste the character. Press Ctrl+V (Windows), Cmd+V (Mac), or long-press and tap Paste (mobile).
6. Confirm. Your name field will appear empty, but it contains the invisible Hangul Filler character. If the game accepts it, you are done.

Your name will now appear completely blank to other players in the lobby and during gameplay. Other players will see an empty name above your character.

Troubleshooting

• "Name must be at least 1 character." Make sure you actually pasted the character. Try copying again from this page.
• Name shows as a square or box. Your device's font or text renderer does not treat Hangul Filler as blank. The character is still there and may appear invisible to other players whose devices render it as blank.
• Name shows the old name. Make sure you deleted the previous name completely before pasting.

Common Uses

• Invisible player names in Among Us. The most commonly recommended method.
• Blank tweets on Twitter/X. Paste Hangul Filler as your tweet text to try posting a tweet that appears empty.
• Empty usernames on platforms that strip whitespace. Often works where regular spaces, NBSP, and zero-width characters are filtered out.
• Invisible text that passes "required field" validation. Forms that require at least one character will accept Hangul Filler, which satisfies the requirement while appearing blank.
• Filler in Korean syllable encoding. Its original purpose in the Korean KS X 1001 character set.

How to Type

Platform Compatibility

These results are based on user reports, not official platform documentation. Platforms change their filters often, so test first.

Why It's a Letter, Not a Space

In the Korean writing system (Hangul), syllable blocks are built from three components:

1. Choseong (initial consonant)
2. Jungseong (medial vowel)
3. Jongseong (final consonant, optional)

The Hangul Filler comes from the Korean KS X 1001 character set, where it marks the start of a syllable spelled out from individual jamo (letters) and fills any of those three positions that is empty. It is a structural placeholder in the encoding. Because it stands in a letter position, Unicode classifies it as a letter (Lo = Letter, Other).

This is not a hack or an unintended side effect. It is genuinely part of how Korean text was encoded. Unicode also marks it as a Default_Ignorable_Code_Point, which is why many renderers show nothing at all, and its letter classification is why it passes through whitespace filters.

Technical Details

• Unicode category: Lo (Letter, Other). This is the key property. It is not Zs (Space Separator) or Cf (Format).
• Bidirectional class: L (Left-to-Right). It behaves as a regular letter in bidirectional text.
• Width: East Asian Width is Wide, but because it is default-ignorable, many renderers draw it as zero-width or as a blank gap depending on the font.
• Word break: Treated as a letter for word-breaking purposes.
• Line break: Treated as an ideographic character for line-breaking purposes.

In JavaScript, you can check for Hangul Filler with:

text.includes('\u3164')// or check Unicode category/\p{Lo}/u.test('\u3164') // true - it's a letter/\p{Zs}/u.test('\u3164') // false - it's not a space

Security Considerations

• Bypasses "non-empty" validation. Any form field, database column, or API parameter that validates for "at least one character" or "non-whitespace content" will accept Hangul Filler as valid input while displaying nothing.
• Creates invisible account names. User accounts with Hangul Filler names are difficult to search for, report, or moderate.
• Confuses string-based matching. Two Hangul Fillers look identical (both invisible), so you cannot distinguish between different "blank" users by name alone.

Hangul Filler vs Other Invisible Characters

The general rule: if one character does not work on a given platform, try the next one down the list. Hangul Filler passes through the most aggressive filters because of its letter classification.

How to Verify It Worked

After pasting Hangul Filler into a name field, you might wonder if it actually worked since the field looks empty. Here are ways to check:

1. Character count. If the platform shows a character count, it should show 1 (not 0).
2. Submit the form. If the platform accepts it without a "name required" error, the character is there.
3. Check in our tool. Paste the text from the field into our Invisible Character Viewer on the homepage. You should see the Hangul Filler highlighted.
4. Use browser dev tools. In Discord or web-based platforms, inspect the element and check its text content for the U+3164 character (for example, run el.textContent.includes('\u3164') in the console).