Man pages matching name bio::graphics::glyph::three_letters in section 3pm:

Bio::Graphics::Glyph::three_letters.3pm.en	debian 10 / libbio-graphics-perl
Bio::Graphics::Glyph::three_letters.3pm.en	debian 11 / libbio-graphics-perl
Bio::Graphics::Glyph::three_letters.3pm.en	debian 12 / libbio-graphics-perl