B612 is an highly legible open source font family designed and tested to be used on aircraft cockpit screens. (Eclipse Public License) http://b612-font.com/ https://www.polarsys.org/proposals/b612-polarsys-font GIT repo: http://git.polarsys.org/c/b612/b612.git/
Looks like the . in the Mono font variants isn't spaced like it's supposed to be.
Sorry, I did not see this bug before. My ebuild just got merged for this font, so this bug can be closed as resolved fixed.
https://packages.gentoo.org/packages/media-fonts/polarsys-b612-fonts
Added to tree in 2a61282 thanks to Jan Henke.