The term 'set into a surface' can be described by two crossword solutions: INLAY (5 letters) and INLAID (6 letters). INLAY is a decorative technique in which pieces of material such as wood, metal, or stone are set into the surface of a larger piece of material. The INLAID pieces are usually cut to fit the shape of the surface and then secured with glue or other adhesives. INLAID pieces can be used to create intricate patterns or designs. INLAID is a form of INLAY where the pieces are cut to fit the surface and then inserted into grooves or channels that have been cut into the surface. This technique is often used to create intricate designs or patterns.