1. a line drawn on a plane
E.g.: 線条 (line, stripe), 直線 (straight line)
2. thread; something thin like a thread
E.g.: 線香 (incense stick), 配線 (wiring)
3. borderline; boundary
E.g.: 死線 (borderline between life and death), 前線 (front line)
4. a fixed path; route
E.g.: 線路 (railway line), 沿線 (along the railway line)
