Analysis of information sources in references of the Wikipedia article "ISO 9" in English language version.
0x52 hook to left which can be mapped to Unicode's comma below U+0326 (while the ISO 5426 also has 0x50 cedilla which can be mapped to Unicode's cedilla U+0327), it also uses ISO 5426 0x53 hook to right which can be mapped to Unicode's ogonek U+0328. See for example Evertype.com's ISO 5426 Archived 2020-10-21 at the Wayback Machine mapping to Unicode or Joan M. Aliprand's Finalized Mapping between Characters of ISO 5426 and ISO/IEC 10646-1 Archived 2020-08-02 at the Wayback Machine.0x52 hook to left which can be mapped to Unicode's comma below U+0326 (while the ISO 5426 also has 0x50 cedilla which can be mapped to Unicode's cedilla U+0327), it also uses ISO 5426 0x53 hook to right which can be mapped to Unicode's ogonek U+0328. See for example Evertype.com's ISO 5426 Archived 2020-10-21 at the Wayback Machine mapping to Unicode or Joan M. Aliprand's Finalized Mapping between Characters of ISO 5426 and ISO/IEC 10646-1 Archived 2020-08-02 at the Wayback Machine.0x52 hook to left which can be mapped to Unicode's comma below U+0326 (while the ISO 5426 also has 0x50 cedilla which can be mapped to Unicode's cedilla U+0327), it also uses ISO 5426 0x53 hook to right which can be mapped to Unicode's ogonek U+0328. See for example Evertype.com's ISO 5426 Archived 2020-10-21 at the Wayback Machine mapping to Unicode or Joan M. Aliprand's Finalized Mapping between Characters of ISO 5426 and ISO/IEC 10646-1 Archived 2020-08-02 at the Wayback Machine.