Cool Train

[JohnS|Dyalog]

I just happened upon this train, which is a pervasive, ambi-valent zero function:

      zero ← |||
      zero 3                       ⍝ zero is ...
0
      2 zero 3                     ⍝ ... ambi-valent
0
      3(4 5) zero (6j7 ¯8.9)42     ⍝ zero is pervasive
┌───┬───┐
│0 0│0 0│
└───┴───┘
      zero ← ||||||||||||          ⍝ alternative coding
      4 zero 5
0
      zero                         ⍝ looks a bit like a centipede
┌─┴─┐                  
| ┌─┼───┐              
  | | ┌─┼───┐          
      | | ┌─┼───┐      
          | | ┌─┼───┐  
              | | ┌─┼─┐
                  | | |

Zero is Phil Last's 0th logic function in http://dfns.dyalog.com/n_logic.htm