Tilde Diaeresis ⍨

Tilde Diaeresis is a monadic operator with a dyadic operand

Operator Tilde Diaeresis means Commute

      2 ⍴ 3     ⍝ ⍺ ⍴ ⍵
3 3
      2 ⍴⍨ 3    ⍝ ⍵ ⍴ ⍺
2 2 2
      ⍴⍨ 3      ⍝ ⍵ ⍴ ⍵
3 3 3

Constant

      'mu'⍨ 'any' ⎕NULL   ⍝ Always returns its operand
mu
      1E100 ('mu'⍨) 1j1
mu
      ¯1⍨¨ ⍳2 3
¯1 ¯1 ¯1
¯1 ¯1 ¯1