If you want to attach symbols to tensors in sub- or superscript, as in $A^\dagger$, you need to inform the system that this symbol is not an index (otherwise it will interpret $A^\dagger A^\dagger$ as two contracted vectors with vector indices $\dagger$). This is done by associating the Symbol property to the symbol; in this example
$$\displaystyle{}\text{Attached property Symbol to }\dagger.$$
$$\displaystyle{}A^{\dagger} A^{\dagger}$$