Get a symbol by its owner and its name

Is there a way to get a symbol if I know its owner and its name?

Positive answer will be very useful for importers (that provide
bijection between universes, e.g. between reflective mirror and
reflective compiler).

Currently importers create a new symbol for every symbol they haven't
seen yet. This means that certain symbols can be created multiple
times - once inside their own universe and once again during an import
from a universe that already has the same symbol.