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⍝ https://aplwiki.com/wiki/Circular
⍝ <operation> ○ <argument>
⍝ sin 0.5
1 ○ 0.5
⍝ sin 1.0
1 ○ 1.0
⍝ sin 0.0
1 ○ 0
⍝ pi π
⍝ https://aplwiki.com/wiki/Pi_Times
⍝ 1 times pi
○1
⍝ 2 times pi
○2
⍝ sin 30deg
⍝ 1 ○ (○1 ×
)OFF