  An enormous variety of quantum nanoobjects and nanosystems calls for the
development of new approaches to their description and parametrization.
Corresponding methods should be simple, universal enough and ensuring the
retention of essential part of information at small number of parameters.
  A universal effective quantum number was introduced earlier and successfully
used for describing centrally symmetric systems. But in most cases nanosystems
own a lower symmetry. In the present article we generalize and adapt this
method for such systems.
