Punctuation:

The subfield preceding subfield $2 in field 655 ends with a mark of punctuation or a closing parenthesis.

Example:

655 #7$aDiaries$zBelgium.$2<thesaurus code>

An index term followed by a subject subdivision does not end with a mark of punctuation unless the preceding term ends with an abbreviation, initial/letter, open date, or other data that end with a mark of punctuation.

Example:

655 #7$aPrayer books$zRhode Island$y18th century.$2<thesaurus code>