What is the name of the white navigation light located at fore and aft centerline of the vessel, showing an unbroken white light over and arc of 225 degrees ?

The white navigation light located at the fore and aft centerline of a vessel, which shows an unbroken white light over an arc of 225 degrees, is known as the "masthead light." This light is typically positioned at the highest point of the vessel, such as on the main mast, to ensure maximum visibility to other vessels. The masthead light is an essential part of maritime navigation and safety regulations, as it allows vessels to signal their position effectively to others, especially during nighttime or low-visibility conditions. The 225-degree arc indicates that the light is visible to other vessels approaching from the front and to the sides, but it is not visible from directly behind, thus providing clear visual identification of the vessel's heading and orientation.