The dolls symbolize both Nora and her children. Just as Nora is a toy and plaything for Torvald, her children seem to be her toys and playthings.
Explanation:
Nora sees her children as dolls. For her, her children as well as the dolls are delicate, beautiful, cute, cool and fun, they need to be cared for, loved and protected, just as a little girl protects her dolls and treats them as darling, delicate and helpless daughters.
