Earlier in our involvement with Touch, Timo and I held a workshop with Alex Jarvis (currently at moo.com) and Mark Williams (now at Venture Three) to explore notation for RFID and the actions hidden in the readers.
One of my favourites that emerged from the day was this one.
It shows how far we were reaching for metaphorical handles – around which to characterise the technology, relying on the verbs associated with the result of the interaction: to Pay, to Open, to Delete etc.
Physically the systems are very different and are more frequently represented by their envelope packaging, like the Oyster card. Branded systems have chosen to use characters, my favourite is the Suica Penguin.
During the visualisation work, the cross sections in the readable volumes that emerged began to feel very strong visually. They capture an essential nature in the technology which is difficult to unearth with symbols based on metaphors.
Timo and I experimented with forms which have an almost typographic nature ranging to a more strictly geometric shape.
We settled on this most geometric version. It would be terrific to see this picked up and used as a symbol for the technology in public.