FEMININE ORDINAL INDICATOR) and
MASCULINE ORDINAL INDICATOR) are now classified as lower case letters by the Prolog parser. They used to be (incorrectly) classified as symbol chars. This may affect code that used any of these characters in unquoted atoms or functors.
This change was made to align their classification with the Unicode standard.
quoted_charset(see Prolog Flags in the SICStus Prolog Manual).