Although a rare word, purlicue is a term for the space between the forefinger and thumb, originally used in the North of England. It’s thought to derive from the Scots term pirlie, meaning ‘curly’ or ‘twisted’, and is also used as a synonym for curlicue: a term in calligraphy to describe curls in a person’s writing. A fraenum is a small ligament that restricts movement between body parts.