Character code of unknown character-character, e.g. square or question mark romb

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Unicode has two symbols for unknown characters:

  • □ (WHITE SQUARE, U+25A1) – Replaces a missing or unsupported Unicode character.
  • � (REPLACEMENT CHARACTER, U+FFFD) – Replaces an invalid or unrecognizable character. Indicates a Unicode error.

Sources

  • Quora – What symbol is the square box shown for non-representable Unicode characters?
  • FileFormat.Info – Unicode Character ‘WHITE SQUARE’ (U+25A1)
  • Wikipedia – Specials (Unicode block)

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