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⊼ — Square / NAND

Function. Keys: Alt-Minus 0. Hanzi: 方/否. Ranks: 0 monadic, 0 0 dyadic

⊼Y: Y2. Pervasive.

⊼[2 3]ₓ           ⍝ [4 9]ₓ

X⊼Y is Boolean NAND. Pervasive.

0 0 1 1⊼0 1 0 1   ⍝ $t $t $t $f

Inverse

⊼⁻Y is √Y.

⊼⁻9   ⍝ 3