The temporary IUPAC systematic naming for atomic number 110 is based on digits:
\[
1 = un,\quad 1 = un,\quad 0 = nil
\]
So the temporary name becomes:
\[
\text{Ununnilium}
\]
Its symbol is:
\[
\boxed{\text{Uun}}
\]
Hence, the correct answer is:
\[
\boxed{(B)}
\]