⊼ — Square / NAND

Function. Keys: Alt-Minus 0. 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

⊼⁻¹Y is √Y.

⊼⁻¹9   ⍝ 3