A CHIGNON is a hairstyle that involves gathering the hair into a knot or bun at the nape of the neck. The term 'CHIGNON' comes from the French phrase 'CHIGNON du cou, ' which translates to 'nape of the neck.' An updo is a type of hairstyle that involves arranging the hair in an intricate way, usually involving twisting, braiding, and pinning the hair. The term 'updo' is often used interchangeably with 'CHIGNON, ' as they are both hairstyles that involve arranging the hair in a particular way.