Unicode Character 'REPLACEMENT CHARACTER' (U+FFFD)

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Do not use this character in domain names. Browsers are blacklisting it because of the potential for phishing.
Unicode Data
Name REPLACEMENT CHARACTER
Block Specials
Category Symbol, Other [So]
Combine 0
BIDI Other Neutrals [ON]
Mirror N
Index entries REPLACEMENT CHARACTER
Comments used to replace an incoming character whose value is unknown or unrepresentable in Unicode
compare the use of U+001A as a control character to indicate the substitute function
Version Unicode 1.1.0 (June, 1993)
Encodings
HTML Entity (decimal) �
HTML Entity (hex) �
How to type in Microsoft Windows Alt +FFFD
UTF-8 (hex) 0xEF 0xBF 0xBD (efbfbd)
UTF-8 (binary) 11101111:10111111:10111101
UTF-16 (hex) 0xFFFD (fffd)
UTF-16 (decimal) 65,533
UTF-32 (hex) 0x0000FFFD (fffd)
UTF-32 (decimal) 65,533
C/C++/Java source code "\uFFFD"
Python source code u"\uFFFD"
More...
Java Data
string.toUpperCase()
string.toLowerCase()
Character.UnicodeBlock SPECIALS
Character.charCount() 1
Character.getDirectionality() DIRECTIONALITY_OTHER_NEUTRALS [13]
Character.getNumericValue() -1
Character.getType() 28
Character.isDefined() Yes
Character.isDigit() No
Character.isIdentifierIgnorable() No
Character.isISOControl() No
Character.isJavaIdentifierPart() No
Character.isJavaIdentifierStart() No
Character.isLetter() No
Character.isLetterOrDigit() No
Character.isLowerCase() No
Character.isMirrored() No
Character.isSpaceChar() No
Character.isSupplementaryCodePoint() No
Character.isTitleCase() No
Character.isUnicodeIdentifierPart() No
Character.isUnicodeIdentifierStart() No
Character.isUpperCase() No
Character.isValidCodePoint() Yes
Character.isWhitespace() No