Aster is the most reduced expression of the naming insight: a six-arm geometric asterisk where star (Astra) and radiating ray (Rad) are literally the same shape. The asterisk is also the glyph radiologists mark directly on an image, so the mark reads as a clinical annotation, not decoration. Built from three round-capped strokes on a single center, it stays crisp and legible from a 16px favicon to a 96px hero, works in one ink color, and gains a cyan center dot as its only accent flourish.