The package implements about as good "poor man's" blackboard bold as one can hope. The capital letters (commands \bbba to \bbbz) and a couple of digits (\bbbzero and \bbbone) are available.

However, the author suggests that users should switch to the amsfonts package.

This package is part of the ncctools bundle.

The author is Alexander I. Rozhenko. The package is Copyright © 2002-2004 Alexander I. Rozhenko.