Sometimes when I reading about typefaces I found some descriptions that I really want to know more; ex: in this text about Lucas de Groot Corpid: "Corpid is now very international and very versatile: we designed a broad range of numeral styles and international character sets, including Greek and Cyrillic, and even a phonetic set for use in dictionaries and textbooks".

What is a phonetic set of a typeface? Is a special form of typeface for use in dictionaries and textbooks?