The platform’s icon set on the Untitled UI spec: a 24px grid, 2px rounded strokes, round caps and joins, no fills. Travel and Weather are taken directly from the Untitled icon file, path for path; marks labelled ours are platform concepts with no stock equivalent, drawn in the same grammar. Every mark takes the current text color, so the whole library holds in both themes. Working sizes are 16, 18, 20 and 24.
An icon never carries meaning alone: it sits beside its word, except in icon buttons, which carry a tooltip. Status icons take status colors; everything else stays in text ink.
The source of truth for every mark is the official package: the free line set and the licensed PRO set, four styles of roughly 1,180 marks each, extracted path for path and never redrawn. The platform speaks line; solid is reserved for the active state of nav icons; duotone serves featured icons in empty states and metric tiles. Duocolor stays unused for now.