| Class | Meaning |
| 0 | Spacing, enclosing, reordrant, and surrounding |
| 1 | Overlays and interior |
| 6 | Tibetan subjoined Letters |
| 7 | Nuktas |
| 8 | Hiragana/Katakana voiced marks |
| 9 | Viramas |
| 10 | Start of fixed position classes |
| 199 | End of fixed position classes |
| 200 | Below left attached |
| 202 | Below attached |
| 204 | Below right attached |
| 208 | Left attached (reordrant around single base character) |
| 210 | Right attached |
| 212 | Above left attached |
| 214 | Above attached |
| 216 | Above right attached |
| 218 | Below left |
| 220 | Below |
| 222 | Below right |
| 224 | Left (reordrant around single base character) |
| 226 | Right |
| 228 | Above left |
| 230 | Above |
| 232 | Above right |
| 234 | Double above |
Note: some of the combining classes in this list do not currently have
members but are specified here for completeness.