\hline (LaTeX2e unofficial reference manual (November 2018))

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#### 8.23.4 `\hline`

Draw a horizontal line the width of the enclosing `tabular` or `array` environment. It’s most commonly used to draw a line at the top, bottom, and between the rows of a table.

In this example the top of the table has two horizontal rules, one above the other, that span both columns. The bottom of the table has a single rule spanning both columns. Because of the `\hline`, the `tabular` second row’s line ending double backslash `\\` is required.

    \begin{tabular}{ll} \hline\hline
      Baseball   &Red Sox  \\
      Basketball &Celtics  \\ \hline
    \end{tabular}

Unofficial LaTeX2e reference manual