1. Shell: This is the most common meaning. It refers to any type of shell, particularly those used for ornaments or jewelry. This is because "pupuli" can also be used to refer to a type of shell used in leis (the traditional Hawaiian garland).
2. Small, rounded object: The word "pupuli" can also refer to any small, rounded object, like a bead or a button. This meaning is often used in conjunction with the first meaning, referring to the shape of a shell.
Therefore, "pupuli" generally refers to shells or small, rounded objects. The specific meaning will depend on the context in which it is used.