Accents is a transformer that removes accents from Latin/Greek/Cyrillic characters.

CanonicalDuplicates is a transformer that folds duplicate singletons (usually when the same character, for historical reasons, has two different code points) (e.g.

Dashes is a transformer that folds everything in Unicode class Pd ("dash punctuation") to hyphen-minus '-'.

Digits is a transformer that folds digits in a native language or a typographical context to a substitute ASCII digit.

GreekLetterforms is a transformer that folds alternative Greek letterforms e.g.

HebrewAlternates is a transformer that folds e.g.

Jamo folding converts from the Hangul Compatibility Jamo Unicode block to the Hangul Jamo Unicode block.

Math folding converts font variants, excluding the HebrewAlternates.

NoBreak folding converts non-breaking space and non-breaking hyphens.

Positional folding performs positional forms folding including Arabic ligatures.

Small folding converts small variant forms into normal forms.

Space folding converts all spaces to a single 0x0020 space.