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The original was posted on /r/todayilearned by /u/usaidr on 2025-07-30 19:59:35+00:00.

Original Title: TIL U+3164 (Hangul Filler) is a Unicode character that looks completely blank but isn’t. It was originally designed as a placeholder for Korean syllables, and today it’s also used in odd text tricks, like blank-looking messages.