A geometric notation placed above two points to indicate a line segment with specified endpoints in Euclidean geometry.
Examples
Basic line segment notation
\text{Line segment } \overlinesegment{AB} \text{ has length 5 units}
Geometric calculation with multiple segments
\overlinesegment{AB} + \overlinesegment{BC} = \overlinesegment{AC}
Triangle perimeter calculation
P = \overlinesegment{AB} + \overlinesegment{BC} + \overlinesegment{CA}