Which type of ahead speed does the symbol "II" indicate when logged in the Engineer's Bell Book?

The symbol "II" in the Engineer's Bell Book is universally recognized as indicating "Full Ahead" speed. This designation is part of the communication system used by the engineering department on a ship to convey orders related to engine speed.

When a vessel operates at full ahead, the engines are at their maximum power output, allowing the ship to achieve its top speed. This is often essential in scenarios that require rapid movement, such as military maneuvers or emergency responses. It is crucial for the engineering personnel to accurately log and follow these indications because they directly affect the ship's operational readiness and maneuverability.

Other terms like "Standard," "Slow," and "Reverse" indicate different operational speeds that are lower than "Full Ahead," and would have their respective symbols in the bell book that differ from "II." This distinction is vital for the proper interpretation of speed orders, ensuring that the crew responds appropriately to navigation and operational demands.