I’ve asked that question repeatedly.  After pulling a few teeth I discovered that it is an “echo”, used to indicate that the named within is Jewish or a Jewish organization.  Some use it unkindly.  Others use it as shorthand.  Where it gets hazy, is when we see (((+))) as a “signature”? on the back of a photo of a VIP-Anon with POTUS. I’m told + represents POTUS. So... is POTUS saying he’s Jewish? I may very well have missed the explanation for that one, as there is a lot of activity on these boards.