The jester cap, also known as the fool's cap, is a whimsical hat worn by court jesters in medieval times. While this particular term is most commonly used, there are several other synonyms for this type of headwear. The bauble hat is another term that has been used to describe the jester cap, as the colorful, dangling baubles or bells adorning the cap are a defining feature. The cockscomb hat, named after the red crest atop a rooster's head, is also a synonym for the jester cap. Finally, the cap 'n' bells is another term that has been used to refer to the jester cap, highlighting the playful nature of this iconic piece of headwear.