NB: More recent documentation for Dyalog APL is available at https://docs.dyalog.com/20.0/.

Logical NAND ⍲

Monadic Logical NAND is not defined

Dyadic Logical NAND means

NAND 

      0 1 0 1 ⍲ 0 0 1 1
1 1 1 0

Language Elements