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~Join~ can already serve as an infix operator. If you want something more concise I recommend choosing one of the existing operators without a built-in meaning. Simply: UnionPlus = Join; {1, 2}⊎{3, 4, 5} {1, 2, 3, 4, 5} (Use InputAliases for fast entry.) If there are none there that you like you might use Rojo's method from Is it possible to ...

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