Mapping of the angle bracket characters at 0xE1 and 0xF1 can vary. Adobe uses code points U+2329 and U+232A (〈 and 〉), whereas Apple uses U+3008 and U+3009 (〈 and 〉). The characters U+3008 and U+3009 are fullwidth punctuation, usually rendered with additional spacing so as to align them within em squares, as appropriate in East Asian typography. The characters U+2329 and U+232A, however, are canonically equivalent to U+3008 and U+3009, and are therefore changed to the latter under both NFC and NFKC Unicode normalisation. This equivalence is sometimes considered mistaken, but cannot be changed under the Unicode stability policy. For comparison, the fullwidth Latin characters in the Halfwidth and Fullwidth Forms block are mapped to their ASCII equivalents using compatibility mapping, not canonical equivalence, and therefore only changed by NFKC and NFKD normalisation. The alternatives U+27E8 and U+27E9 (⟨ and ⟩) are now preferred for mathematical use.