Related Clues:
- "For ___ waves of grain"
- Use the turn indicator
- Drive-through color?
- Communication by sign
- Gesture, light or sound which sends a message
- Fossil resin or warning light
- Indication or warning
- Warning light
- Communication that encodes a message
- Sign that conveys a message
- Traffic-light between red and green
- Gesture to communicate
- Gesture of communication
- Yellowish-brown colour or resin
- Gesture or object giving information