By Year 3 (7/8 years old) children are expected to know the names of, and recognise, some quite tricky 3-D shapes. These include prisms, cuboids, cylinders and pyramids. As well as this the term prism can be used for a variety of shapes, including triangular prism, hexagonal prism and octagonal prism. These terms are not really used in everyday life and many adults would not know what the terms mean. If children are to become familiar with them they will need a lot of practice naming the shapes and recognising their properties.
It is a good idea to try and collect examples of these shapes from shopping and packaging, even if it does mean buying a rather expensive bar of chocolate!