A red ‘crystal’ has joined the Red Cross and Red Crescent as an emblem for ambulances and relief workers. This is because Israel refuse to use either the Cross or the Crescent, and other Middle-Eastern nations refuse to accept a red Cross of David.
What they really ought to do, of course, is scrap the Red Cross and Red Crescent in favour of just one politically and religiously neutral symbol – the crystal, presumably. But it took them ten years to come up with the current compromise, so don’t expect that to happen any time soon.