Chinese Character Code for Information Interchange
Structure of CCCII| Layer | Plane | Content |
| 1 | 1 - 6 | Non-hanzi and hanzi |
| 2 | 7 - 12 | Simplified hanzi (PRC) |
| 3 - 12 | 13 - 72 | Variant forms of hanzi from layer 1 |
| 13 | 73 - 78 | Japanese kana and kanji |
| 14 | 79 - 84 | Korean jamo, hangul and hanja |
| 15 | 85 - 90 | Reserved |
| 16 | 91 - 94 | Other characters |
Structure of layer 1
| Range | Characters | |
| Control character (plane 1) | row 1 | 0 |
| Chinese punctuation (plane 1) | row 11 | 35 |
| Classical radicals (plane 1) | row 12 - 14 | 214 |
| Chinese numerals and phonetic symbols (plane 1) | row 15 | 78 |
| Most frequently-used hanzi (plane 1) | row 16 - 67 | 4 808 |
| Next most frequently-used hanzi (plane 1 - 3) | row 68 - 64 | 17 032 |
| Other hanzi (plane 3 - 6) | row 65 - 5 | 20 583 |
| Total | 42 750 |
To display one character there are 3 bytes used, for variant characters the first two bytes are equal to the reference character, the third character represents the layer. The characters are ordend by radical and then by increasing number of strokes.
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