Moustachium Bar

Moustachium is an new crafting element that was added along with the April 28th, 2011 patch. According to the blogpost, by earning certain achievements on 'SpaceChem', one can unlock this element to craft special SpaceChem-themed items, including a fishcake.

Also according the the blogpost, this is a new trend that has just kicked off, thus we may see more elements usable in crafting in the future.