In electrical schematics and single-line diagrams, an overhead line is typically represented by a single, straight line. ⚡ To distinguish it from an underground cable or other connections, the line is often accompanied by a visual marker. The most common symbol is a line with a short horizontal "T" or "I" mark at each end, representing the pole or tower on which the line is supported.

This symbol is a simplified representation used in one-line diagrams to show the path of the electrical circuit without detailing every single component. It's a quick and efficient way for engineers to communicate the overall structure of the transmission or distribution system.