Wow, yep. I’d heard of it, and due to the name I never even bothered to look at it til seeing this post. Looks like amazing software.
I have dipped my toe into TeXmacs (and bought a copy of The Jolly Writer to support the project). Basically you can walk up, bang out a couple of pages with text, mathematics, diagrams and (say) R script output nicely typeset and save as PDF or whatever. Ideal for quick papers and such.
TeXmacs does need a few processor cycles compared with LyX but you won't notice battery drain unduly on anything post Core Duo.
Addressing the actual question: I think a tag line like 'your libre scientific wordprocessor' would help.