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Plus (+)
+ 𝕩: Conjugate
Complex conjugate of 𝕩. BQN doesn't support complex numbers yet, so it has no effect.
+ 1
+ ¯1
𝕨 + 𝕩: Add
𝕨 added to 𝕩. Either 𝕨 or 𝕩 can be a character, and if so, the other has to be an integer.
1 + 2
1 + 2‿3‿4
'a' + 4