𝕊
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A variable assigned to the current function block. 𝕤 accesses the same value but has a subject role.
𝕤
𝕊 can be used for recursion.
F ← {𝕊 0: 1; 𝕩 × 𝕊 𝕩-1} # Factorial F 5 120 {𝕤‿𝕤}4 ⟨ (function block) (function block) ⟩