Definition from the Unicode standard (4.0): "Deprecated character: A coded character whose use is strongly discouraged. Such characters are retained in the standard, but should not be used. Deprecated characters are retained in the standard so that conforming data stay conformant in future versions of the standard. Deprecated characters should not be confused with obsolete characters which are historical. Obsolete characters do not occur in modern text, but they are not deprecated, their use is not discouraged."