Question

symbol: dropdown box and box (with a vertical line segment above labeled o, r, t from top to bottom, and two horizontal arrowed boxes below)

Explanation:

Step1: Identify the line segment

The figure shows a line with points O, R, T. The segments here are OR and RT (or RO and TR, but OR and RT are more direct as R is between O and T). The symbol for a line segment is $\overline{}$, so we use that.

Step2: Determine the segments

The two segments are $\overline{OR}$ (or $\overline{RO}$) and $\overline{RT}$ (or $\overline{TR}$). The symbol for the segments is the line segment symbol, so the symbol is $\overline{}$, and the segments are $\overline{OR}$ and $\overline{RT}$ (or other order with the same segments).

Answer:

Symbol: $\boldsymbol{\overline{}}$
$\boldsymbol{\overline{OR}}$ and $\boldsymbol{\overline{RT}}$ (or $\boldsymbol{\overline{RO}}$ and $\boldsymbol{\overline{TR}}$)