Lettering aids are tools used to help create lettering and other designs. Stencils are one type of lettering aid that can be used to quickly and easily create a design. Stencils are typically made of thin plastic or metal and have cut-out shapes of letters, numbers, or symbols. They can be used to trace the desired design onto a surface, such as paper or fabric. Stencils are a great way to create uniform lettering and designs with ease.