A Camera Bag full of Photographers

The Cobb in Lyme Regis (strangely enough there is a programme about Lyme Regis on BBC1 as I write - "Attenborough and the Sea Dragon"). 
There was a large group of photographers on the Cobb, all with tripods,  (look large and you will see) and we had a short chat. I almost asked them if they were Blippers. We could do with some sort of sign or secret nod to identify ourselves. The only problem is if they're not, they may think the other person is winking at them.