Monday Mutant 16: Polyominous (cipher)

Monday Mutants is a series in which I will attempt to experiment with "mutant" puzzles. These could be existing puzzle types with an unusual change in the rules, hybrids combining elements from multiple puzzle types, or puzzle types neither invented nor popularized by Nikoli.
In this Polyominous puzzle, the given numbers have been replaced by letters or symbols; all instances of a particular letter or symbol represent the same number, but two different letters or symbols must represent different numbers. The rules are otherwise unchanged.

This puzzle is a tribute to two legends.

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