Signal/ˈsɪɡnəl/ Definition 1 of 3Pro Tip 1/3Intention Clues Signals often show someone's future action, like turning a car. The cyclist gave a hand signal before taking a left turn. Pro Tip 2/3Cultural Variations Some signals have different meanings across cultures; learn the local ones. A nod is a signal for 'yes' in many cultures, but not all. Pro Tip 3/3Visual Importance Visual signals are designed to be simple and easily noticeable. The red hand signal means 'do not walk' across the road.