Normalization Form C (NFC) resolves different Unicode spellings that represent the same character by canonically decomposing a sequence and then recomposing it into a canonical composed form. Thus U+00E9 and U+0065 U+0301 both normalize to U+00E9. section 9.3
Canonical recomposition
NFC maps \u00C5 → \u0041\u030A → \u00C5. It also maps the Angstrom sign \u212B through the same decomposition to the canonical character \u00C5; similarly, the Ohm sign \u2126 maps through Greek Omega \u03A9. section 9.3
For C identifiers, apply these rules:
- Allow alphabetic letters only when they map to themselves under NFC. section 9.3
- Prefer alphabetic letters originating directly from natural languages. section 9.3
