Complex is the head used for complex numbers.

Enter a complex number: In[1]:=1 + 2 I Out[1]=1 + 2 i Complex is the Head for complex numbers: In[2]:=Head[%] Out[2]=Complex

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Complexes | Real | Re | Im | ReIm | I | ComplexExpand | Conjugate | NumericQ

541st most common (1 in 29100 symbols)

263rd most common (1 in 6150 symbols)

940th most common (1 in 17500 symbols)

introduced in Version 1 (June 1988)