For these uses, the characters U+27E8MATHEMATICAL LEFT ANGLE BRACKET and U+27E9MATHEMATICAL RIGHT ANGLE BRACKET should be used.
The characters U+2329LEFT-POINTING ANGLE BRACKET and U+232ARIGHT-POINTING ANGLE BRACKET are "deprecated and are strongly discouraged for mathematical use because of their canonical equivalence to CJK punctuation" U+3008LEFT ANGLE BRACKET〈 and U+3009RIGHT ANGLE BRACKET〉.[1]