SymmetricDifference

SymmetricDifference[list1, list2, ...] gives the symmetric difference of the lists listi.

Examples

Find elements in one list but not both:

SymmetricDifference[{1, 2, 3, 4}, {3, 4, 5, 6}]

With multiple lists:

SymmetricDifference[{a, b, c}, {b, c, d}, {c, d, e}]

Please visit the official Wolfram Language Reference for more details.