Word and symbol for putting two sets in to a larger set?

Question

After doing some work with sigma-algebra, I'm stunned that I can't recall ever seeing any name or notation for this. However, consulting Google and Wikipedia has turned up nothing. What I'm looking for is quite simple, I want to find a name and symbol (I'll use $\cdot$ for now) for whatever set operation would give results such as $\{1\} \cdot \{2\} = \{\{1\}, \{2\}\}$. Obviously, I would like to make some appeal to the idea of a collection of sets, but I've never seen any terminology such as "{A, B} is the collection of the two sets A and B".