Peter Kümmel wrote: > But aren't only 'L' and 'X' capital letters: LyX? > Seems ALL logos ignore this.
I don't think so. LyX's logo, \LyX, outputs three capitals. This is the same for \TeX, \LaTeX \XeTeX etc. I'd say that "LyX" is a transliteration of the logo, the lower case letter "symbolizes" the lowered capital in the logo. Again, cf. TeX, LaTeX, XeTeX. Jürgen