An anchor light is a type of maritime signal light used in naval communications to signify to other waterborne traffic that a vessel is anchored and not in motion. Predominantly, it is a white light, placed on the highest reachable point on the ship, usually the mast, designed to be visible from all directions. When a ship deploys its anchor, reflecting that it is stationary and not under command, this light is turned on as a stipulation of maritime law. Its function is solely to notify other ships to maintain a safe distance to prevent collision, especially during the night or conditions of poor visibility. Ships exceeding 150 feet (approximately 46 meters) in length are required, as per international navigation laws, to display two such lights, one at the bow and one at the stern, to further specify their size and orientation.

1. The fishing vessel sat idly in the harbor throughout the night, its anchor light twinkly brightly to signify that it was at rest and not planning to navigate further. 2. When sailing at night, it is essential always to keep an eye out for the anchor light of other ships to avoid colliding with vessels that are immobile. 3. As per maritime regulations, a large container ship at rest over 150 feet in length should always display two anchor lights, which are typically visible from a considerable distance. 4. During their night patrol, the coast guard spotted an anchor light in the distance, indicating a boat was anchored and stationary in the prohibited area. 5. From afar, the two anchor lights of the colossal cruise liner shone in the pitch-black night, creating a beautiful but potentially dangerous sight. The two lights signaled that the liner was at anchor. Any passing vessels needed to take cautious action to avoid a devastating collision.

The Anchor Light is an essential maritime signal that is used internationally to prevent collisions at sea. Displayed as a white light, it informs other vessels that a ship is at anchor, meaning it isn't currently moving as it's attached to the sea bed. Due to its significant function, it is a requirement under the International Regulations for Preventing Collisions at Sea. Interestingly, if a ship is over 150 feet (46 meters) in length, it must display two anchor lights - one at the bow (the front end) and another at the stern (the rear end). This dual light system ensures the larger ship's size, position, and status can be easily identified from all angles, thereby increasing safety for all seafarers nearby.