The term SIGN-MAKING TOOL can be summarized by the crossword solution of STENCIL. A STENCIL is a tool used to create signs and other designs. It is typically made from thin sheets of plastic or metal, and the design is cut out of the material. The STENCIL is then placed on a surface and paint is applied through the openings in the STENCIL. This allows for the creation of precise and uniform designs. Stencils are commonly used in sign-making, as well as in art and craft projects.