The term 'SHARP FASTENER' can be summarized as a small, pointed object used to secure two objects together. The crossword solution for this term is 'TACK', which is a type of fastener that has a sharp point at one end and a flat head at the other. It is typically made of metal or plastic and is used to attach fabric, paper, or thin wood to a surface. Tacks are often used in upholstery, carpentry, and other crafts.