This is my first time designing for a startup, but I really believe in their mission. This logo and business card was for Ferro Technologies, their website is at http://ferro.watch.
Their product is a watch which can be used instead of credit cards with credit card readers. Inductive coils produce the electromagnetic signature, allowing the user to pay at any store with a card swipe without any special additions (other smart watches require RF).
The logo incorporates the coils, the swipe, the security of the service, and the streamlined elements that bring the product together.