# `⊽` — Double / NOR

Function. Keys: `Alt-Minus 9`. Ranks: `0` monadic, `0 0` dyadic

`⊽Y`: 2Y. Pervasive.

``` bpl
⊽1r3              ⍝ 2r3
```

`X⊽Y` is Boolean NOR. Pervasive.

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

## Inverse

`⊽⁻¹Y` halves `Y`.

``` bpl
⊽⁻¹8   ⍝ 4
```