Metal lattice work is a type of structure made from metal bars or wires that are arranged in a criss-cross pattern. It is often used as a decorative feature, but can also be used for security purposes, such as in fencing or grates. The term 'GRATE' is a five-letter word that is commonly used to describe metal lattice work. Grates are typically used to cover openings, such as drains or ventilation systems, and can be found in many public places.