When you place one end paper over the top of the hair stand as you wrap it around the perm tool it is called a?

When you place one end paper over the top of the hair strand as you wrap it around the perm tool, it is called a "bookend" technique. This method helps to secure the hair and ensures an even distribution of the perm solution, minimizing frizz and promoting uniform curls. It is especially useful for shorter hair lengths or for achieving a more defined curl.