Physical Hyperlinks (Physical World Hyperlinks) are any machine readable identifier (1D and 2D barcodes, RFID tag, image, sound, fingerprint) that can be resolved by a cell phone to dial a phone number, start an email, or facilitate a direct Internet connection. In Japan today, 2D barcodes called QR ("Quick Response") codes, originally used for inventory management, are now proliferating on business cards, in magazine ads and product packaging. QR codes displayed on All Nippon Airways kiosks now allow cellphone users to travel with paperless electronic tickets. On 3G phones with good built-in cameras, even QR codes on billboards can be resolved by the camera phone, to play a movie trailer, provide a coupon code, etc.