A cleat in the context of nautical parlance is a specially designed fitting, typically made from robust materials such as metal or hard plastic, to which ropes or lines are securely fastened. The classic form of this powerful and vital sailing device somewhat resembles the shape of an anvil, reflecting a broader, bottom section and a narrower, upper section. It consists of two "horns" protruding outward onto which lines are typically wrapped, belayed, or tied to create a secure connection. This versatile piece of marine hardware serves many purposes on a boat, including but not limited to, securing anchor or mooring lines, tying off sails, or fastening any other rigging or equipment that requires a robust, fixed point of attachment.

1. Nautical Cleat: These types of cleats are common on boats and ships, made of sturdy materials like stainless steel, aluminium or iron. They are designed so sailors can quickly and securely tie ropes in a variety of ways for different maritime activities, such as anchoring, docking, or adjusting sails. 2. Dock Cleat: These are large metal fixtures attached to the planks of a dock. They are designed to secure boats to the dock using ropes or lines. Dock cleats often have a traditional horned design for easy, secure fastening. 3. Deck Cleat: These cleats are mounted on the deck of a ship for tying off various lines. They allow the ship's crew to efficiently manage sails, anchor lines, and other rigging tasks. 4. Cam Cleat: This type of cleat commonly seen on a sailboat, has two spring-loaded cams that hold the rope tightly in place. The rope can be removed swiftly when required, while the cleat holds firm when loaded. 5. Horn Cleat: A horn cleat is the most traditional and most recognized type of cleat. It has two horns protruding from a base, and it looks somewhat like an anvil. All types of lines can be attached to it, most commonly used for dock or mooring lines.

Cleats, which are fittings to which lines are made fast, have a rich maritime history and are found on almost every ship, yacht, and sailing boat around the world. The classic cleat to which lines are belayed, or secured, is roughly anvil-shaped. One might wonder why this shape? This goes back centuries when maritime crafts were largely wooden vessels. The iconic shape is not just for aesthetic reasons, but it serves various smart and practical features. The anvil shape of the classic cleat has two "horns" – which allows the rope to be fastened in a figure-eight knot, known as a cleat hitch. This knot is known for being easily tied and easily untied, but holds firm under load, providing security without risk of jamming. In addition, the anvil center provides a strong base where the cleat can withstand a hefty load. So, sailors can be assured that no matter how rough the seas, their ropes will stay secure. Fun fact, typical materials used in cleat construction are resistant to the marine environment, like stainless steel or brass, but the earliest cleats were often wooden and evolved to today's designs. Therefore, this simple, practical, anvil-shaped cleat has demonstrated a design perfection that continues to play an essential role in maritime safety and efficiency even today, truly embodying the phrase "if it ain't broke, don't fix it".