From type/Numeric

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multi method conj(Numeric:D --> Numeric:D)

Returns the complex conjugate of the number. Returns the number itself for real numbers.

From type/Cool

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method conj()

Coerces the invocant to Numeric and returns the Complex conjugate (that is, the number with the sign of the imaginary part negated).

say (1+2i).conj;        # OUTPUT: «1-2i␤»

From type/Complex

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method conj(Complex:D: --> Complex:D)

Returns the complex conjugate of the invocant (that is, the number with the sign of the imaginary part negated).

say (1-4i).conj;                # OUTPUT: «1+4i␤»