Text make up a sign, after all your name is your sign and the texts can be flat or built-up. Built-up is a very common way of displaying name and means 3-D to create depth and a quality look. They can be built in any type of material, from aluminium, stainless steel and acrylic through to timbers, yellow metals, steels and many others. When they are built up they can then also house lighting, generally LEDs and neon, so as to create face, halo and edge illumination. Flat letters can be produced in similar variants of materials but are generally unlit. However, LEDs are now capable of being embedded into flat cut thick acrylic and this is currently well used to create very slim illuminated lettering.