A bar pin is a type of jewelry fastener that is used to secure a piece of jewelry to clothing. This type of pin is often used to secure a brooch or other decorative item to a lapel or collar. There are several synonyms for the term "bar pin", including "clasp", "fastener", "pin", and "barrette". Each of these synonyms refers to a similar type of item that is used to secure jewelry to clothing. Regardless of the term used to describe the fastener, the goal is the same: to keep the jewelry in place and prevent it from slipping or falling off.