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# Mathematical Double-struck S (`𝕊`)

## `𝕊`: Current Function

A variable assigned to the current function block. `𝕤` can be used to access the current function block as a subject.

`𝕊` can be used for recursion.

        F ← {𝕊 0: 1; 𝕩 × 𝕊 𝕩-1} # Factorial
        F 5

        {𝕤‿𝕤}4