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Circle Diaeresis is a Dyadic operator with an ambivalent left operand

Operator Circle Diaeresis means

Over

      -⍥⌊ 3.6                 ⍝ Same as ∘ or ⍤ monadically
¯3
      5.1 -⍥⌊ 3.6             ⍝ Applies ⌊ to both arguments
2
      'Dyalog' ≡⍥⎕C 'DYALOG'  ⍝ Case-insensitive match
1
      'Dyalog' ≡⍥⎕C 'IBM'
0

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