What does horizontal line above variable means?

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I have a simple equation which looks like that except that there placed vector signs there are straight horizontal lines: \begin{equation} \ z = i^8 + \overline{z_1} \cdot \overline{z_1} -z_1 ;\\ \ z_1 = 2-3i , \\ \ z_2 = 1+i \end{equation}

What does these horizontal lines means?

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2 Answers

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Complex conjugate. ${}{}{}{}{}$

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In fact I do not see horizontal line but vector arrow. This kind of arrow means that variable is a vector but taking in account that those variables are complex numbers Gerry Myerson may be right that this is complex conjugate and there should be horizontal line instead of arrow.

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