An accent symbol placing a wide tilde over multiple characters, commonly used in algebra and topology to indicate equivalence relations.
Examples
Denoting a path in topology
\utilde{\gamma} \text{ represents a lifted path}
Marking a segment in geometry
\text{Let } \utilde{AB} \text{ be the arc connecting points A and B}
Indicating a curve in differential geometry
\text{The curve } \utilde{C} \text{ is a geodesic on the surface}