The term TOY BUILDING BRICK can be summarized as a type of toy that consists of interlocking pieces that can be used to construct various structures. The most popular example of this type of toy is LEGO, which is a four-letter word. LEGO has been around since 1949 and is now one of the most popular toys in the world. It is made up of small plastic blocks that can be connected together to create anything from buildings to vehicles.