Blackboard variants of Computer Modern fonts. The fonts are
distributed as Metafont source (only); LaTeX support is
available with the bbm-macros package. The Sauter font package
has Metafont parameter source files for building the fonts at
more sizes than you could reasonably imagine. A sample of these
fonts appears in the blackboard bold sampler.

Homepage:
https://www.tug.org/texlive/
