Plus (+)

+ 𝕩: Conjugate

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Complex conjugate of 𝕩. BQN doesn't support complex numbers yet, so it has no effect.

↗️
    + 1
1

    + ¯1
¯1

𝕨 + 𝕩: Add

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𝕨 added to 𝕩. Either 𝕨 or 𝕩 can be a character, and if so, the other has to be an integer.

Pervasive.

↗️
    1 + 2
3

    1 + 2‿3‿4
⟨ 3 4 5 ⟩

    'a' + 4
'e'