Braille Pattern Blank U+2800

The Braille Pattern Blank (U+2800) is the empty character from the Braille writing system. In Braille, each character is a pattern of raised dots in a 2x3 (or 2x4) grid. The blank pattern has no raised dots, so nothing shows.

Unicode classifies it as a Symbol (So), not whitespace (Zs) or a format character (Cf), so it often passes input validation and whitespace-stripping filters while rendering as blank. With the Hangul Filler (U+3164), it is one of the two most versatile invisible characters platforms accept.

Common Uses

• Blank usernames where spaces, NBSP, and zero-width characters all get stripped.
• Empty-looking messages, comments, and bios on Discord, Instagram, TikTok, and others.
• Visual blank lines. Where a platform collapses multiple newlines into one, put it on a line by itself.
• "Required field" checks. Forms that check for non-whitespace content accept it.
• Backup for Hangul Filler. It sits in a different Unicode block, so it often survives filters that target Hangul characters.

How to Type

Platform Compatibility

Based on user reports, not official platform documentation. Platforms change their filters often, so test first.

How Braille Characters Work

The standard cell has 6 dot positions:

[1] [4][2] [5][3] [6]

Each dot combination is a different character:

• Dot 1 alone = the letter "a"
• Dots 1 and 2 = the letter "b"
• Dots 1 and 4 = the letter "c"

U+2800 represents empty space in Braille text. Unicode has 256 Braille patterns (U+2800 through U+28FF), covering every combination of the 8 dots in the extended 2x4 grid.

Technical Details

• Unicode category: So (Symbol, Other), not Zs (space) or Cf (format).
• Bidirectional class: L (Left-to-Right).
• Width: Normal character width, not zero-width. The space it takes is blank.
• Word break: Treated as a regular character.
• General category test: \p{So} matches it, \p{Zs} does not, \p{L} does not.

In JavaScript:

// Detect Braille Pattern Blanktext.includes('\u2800')
// Check its category - it's a symbol, not whitespace/\p{Zs}/u.test('\u2800')  // false/\p{So}/u.test('\u2800')  // true
// Remove all Braille blankstext.replace(/\u2800/g, '')

Security Considerations

• Passes non-empty validation. Fields that require "at least one character" accept it.
• Invisible but space-occupying. Unlike zero-width characters, it can shift layout slightly.
• Hard to moderate. Posts made only of Braille blanks look empty but still take database space, and checks for empty submissions may miss them.

Braille Pattern Blank vs Other Invisible Characters

Whitespace filters typically check for Zs and other whitespace, and format filters check for Cf. Braille Pattern Blank is So, which many filters don't check at all.