Haiku OS uses vector icons in a a format called HVIF, a much more efficient format than SVG: http://haiku-os.org/docs/userguide/en/applications/icon-o-matic.ht

Haiku OS uses vector icons in a a format called HVIF, a much more efficient format than SVG: http://haiku-os.org/docs/userguide/en/applications/icon-o-matic.html#bitmap-vector http://haiku-os.org/docs/userguide/en/applications/icon-o-ma... https://www.haiku-os.org/articles/2009-09-14_why_haiku_vector_icons_are_so_small https://www.haiku-os.org/articles/2009-09-14_why_haiku_vecto...