Filter Hook: Specifies the character used for all non-alphabetic titles, such as numeric titles in the default setup for English. Defaults to ‘#’ unless overridden by a language pack.

Filter Hook: Specifies the character used for all non-alphabetic titles, such as numeric titles in the default setup for English. Defaults to ‘#’ unless overridden by a language pack.

Filter Hook: Filters the alphabet. The string should contain groups of similar or identical characters separated by commas. The first character in each group is the one used for the group title.