I was wondering how to get the mathbb font in lowercase letters. I found the font but the lowercase letters are math symbols as (f) = (\mho).

So my question is simple, is there a way to get these letters in the latex document

  • 1
    the ams font is uppercase only, some fonts have lowercase, eg stix2 package Commented Jul 6, 2022 at 14:10
  • Please look into cmathbb.sty
    – MadyYuvi
    Commented Jul 6, 2022 at 14:30

3 Answers 3


You just need to use a blackboard bold font that actually has lowercase letters, unlike AMS's blackboard font obtained with amssymb. The package mathalpha provides several options, which are listed in the documentation.

For example, here are the lowercase letters of Libertinus's blackboard bold font, obtained with the option bb=libus.


As another example, here's the result if bb=libus is changed to bb=stix.

  • Thanks!! But the mathbb font (Blackboard Bold) gives an outline effect on cmr10 font. I wonder if there's a font that gives these outline for lowercase cmr10 font and upper/lowercase cmmi10 font
    – Agente 156
    Commented Jul 7, 2022 at 17:15
  • @Agente156 Unfortunately, AMS's blackboard bold font does not have lowercase letters, so (as far as I know) another font must be used to get these symbols.
    – Vincent
    Commented Jul 7, 2022 at 18:09

Open Type fonts (.otf) are accessible via unicode-math package (compile with xelatex/lualatex), for example the TexGyre Math fonts. Lower case Latin bb is part of Unicode now.

lowercase latin bb




I just created in Photoshop the font style I wanted to do, applying the blackboard bold font effect on cmmi10 font, instead of using others similars. I wonder if we can combine this font with bb and make it offcial.

enter image description here

  • 1
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    Commented Jul 13, 2022 at 11:42

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