All I can say is TMS stands for tahitian moon sand.
It's an attractive substrate, but I wouldn't recommend it for a large community and/or planted tank(or any other uniformly colored sand for that matter). For me, it loses it's appeal the minute detritus starts to pile up on the surface.
Also, it's jagged edged compared to most sand, which is rounded, and that's prompted some people to say it's unsafe. Although I'd never use it again for the same purpose, I'm currently using a small layer of it in a 'nano' planted tank and I've got numerous small fish and invertibrates who don't seem to have any issues with it - despite the stories.