An Anchor Ball is a visual signaling device used in maritime communication to indicate that a vessel, such as a yacht, is anchored. It is characterized by its round shape and its distinct black color, which ensures its visibility even under varying lighting conditions. The Anchor Ball must be hoisted up high on a mast or another prominent position in order to be seen clearly by surrounding vessels, thereby alerting them to the stationary status of the yacht. Used primarily during daylight hours, its universal black, circular design enables smooth communication across different language barriers in global navigation.

1. The luxury yacht situated in the center of the harbor had an anchor ball hoisted on its top, clearly indicating it was anchored securely. 2. During the annual boating festival, it's easy to distinguish which yachts are docked and anchored by looking for the anchor ball, a black spherical object, raised high into the sky. 3. To clearly communicate that they were stationary due to a fishing task, the captain of the yacht hoisted up the anchor ball. 4. The black round shape above the mast of the yacht signified the anchor ball, showing to other sailors that the yacht was not moving but at anchor. 5. Spotting an anchor ball on the yacht at a distance, the coast guard knew that the vessel was not in any danger but securely anchored.

The Anchor Ball, known formally as an anchoring day shape, is recognized internationally as an essential communication tool in maritime environments. This round, black shape is displayed on a yacht or ship during daylight hours whenever it is anchored, signaling to all other vessels in the vicinity that the boat is not under command and hence, it cannot maneuver as per normal. Its conventional design, straightforward as a solid black sphere, breaks any language barrier to convey the same significant message to mariners worldwide. One interesting feature is that it can be collapsed for storage and expanded for use, similar to a lantern. Although it is not required for private recreational boats less than 20 meters or 65 feet in length, many experienced sailors continue the tradition for safety purposes, making the anchor ball an intriguing blend of practical utility and maritime tradition.