# `⊼` — Square / NAND

Function. Keys: `Alt-Minus 0`. Ranks: `0` monadic, `0 0` dyadic

`⊼Y`: Y<sup>2</sup>. Pervasive.

``` bpl
⊼[2 3]ₓ           ⍝ [4 9]ₓ
```

`X⊼Y` is Boolean NAND. Pervasive.

``` bpl
0 0 1 1⊼0 1 0 1   ⍝ $t $t $t $f
```

## Inverse

`⊼⁻¹Y` is `√Y`.

``` bpl
⊼⁻¹9   ⍝ 3
```