Definition:Imaginary Unit/Also denoted as

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Imaginary Unit: Also denoted as

The non-italicized $\mathrm i$ can also be seen.

Using the formal definition of complex numbers, the imaginary unit is the ordered pair $\tuple {0, 1}$.

When mathematics is applied to engineering, in particular electrical and electronic engineering, the symbol $j$ is usually used

This is because $i$ is the standard symbol used to denote the flow of electric current, and to use it also for $\sqrt {-1}$ would cause untold confusion.

In some mathematical traditions, the Greek symbol $\iota$ (iota) is used for $i$.