Compatibility equivalence relates Unicode sequences whose compatibility decompositions agree, including distinctions that may matter in some contexts. It includes canonical matches but can additionally identify characters differing in formatting or conventional presentation. Unicode normalization forms NFKD and NFKC use these broader decompositions.[ref]
Unicode Normalization Forms by the Unicode Consortium. §1.1, Compatibility Equivalence; §1.2, compatibility normalization forms
For example, the circled digit
U+2460 and ordinary digit U+0031 both normalize to 1 under NFKC. NFC retains their distinction. A circled list marker and an ordinary numeral can therefore become indistinguishable under compatibility normalization, even when an application wanted to preserve the original notation. The choice is a representation policy, not a test of visual similarity: applying compatibility normalization requires deciding which distinctions the task may safely discard. Articles by others on the same topic
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