The term 'plastic brick' refers to LEGO, a popular construction toy consisting of interlocking plastic bricks. LEGO was first introduced in 1949 and has since become one of the most successful toys of all time. The name LEGO is derived from the Danish phrase 'leg godt, ' which means 'play well.' LEGO bricks are used to create models of all shapes and sizes, and can be used to build anything from simple houses to complex robots.