In the diagram provided, the line segment $\overline{UW}$ is marked in such a way that it appears to connect vertex $U$ of triangle $UVX$ to point $W$, which lies on side $VX$. Additionally, the red markings on side $VX$ suggest that $W$ is the midpoint of $VX$.

When a line segment connects a vertex of a triangle to the midpoint of the opposite side, it is called a median. Therefore, the correct term to describe $\overline{UW}$ is median.

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