Buoy

1. A float, often having a bell or light, moored in water as a warning of danger or as a marker for a channel. Pronounced as Bu-ee. Some navigational buoys are fitted with a bell or gong, which sounds when waves move the buoy
2. The word "buoyed" can also be used figuratively. For example, a person can buoy ('lift up') someone's spirits by providing help and empathy.