This is a format for presenting fonts in PDF files that was initially conceived to store symbols in the Japanese and Chinese languages because it had a 16-bit structure and allowed for more precise adjustment. CID expands the the potential for PostScript by supporting languages that do not have a left-to-right orientation, and by supporting even a vertical mode of orientation.
This is a 7-bit font format used for directly downloading to a PostScript printer. It has two character encoding in hexadecimal. It has good compatibility with multiple font formats. PFA contains an outline for font symbols and is formatted in ASCII text data.