What Is Hangul Filler (U+3164)?
The character behind almost every blank text trick. Where it comes from, how it works and when to use an alternative.
Hangul Filler in one sentence
Hangul Filler (U+3164) is a filler letter from the Korean script that draws nothing on screen. Unicode classes it as a letter (category Lo), not a space, so apps don’t remove it when you send a blank message or save an invisible name.
Where does it come from?
In Hangul, each syllable is built from several sound parts. Hangul Filler fills an empty part when a syllable is incomplete. It sits in the Hangul Compatibility Jamo block and has been part of Unicode for a long time.
Why don’t apps remove it?
Before saving text, apps usually run trim(), which deletes spaces at the start and end. trim() only removes characters classed as spaces. Hangul Filler is a letter, so it stays, and the field counts as filled.
Hangul Filler codes
HTML: ㅤ · CSS: \3164 · JavaScript: \u3164 · UTF-8: E3 85 A4. Codes for other characters are on the Unicode list page.
If Hangul Filler is rejected
Some apps add filters just for U+3164. The closest alternatives are Halfwidth Hangul Filler (U+FFA0), Hangul Choseong Filler (U+115F) and Braille Pattern Blank (U+2800). Braille blank is a symbol, so it often passes filters aimed at Korean letters.
Is it safe to use?
Hangul Filler is an ordinary Unicode character and breaks nothing. What matters is platform rules: some games and social networks ban invisible names, especially for impersonation or spam.
Frequently asked questions
Is Hangul Filler the same as a space?
No. A space is a separator (Zs); Hangul Filler is a letter (Lo).
Where can I copy it?
On the Invisible Character page, in one tap.