ISO/IEC 14443

Citation
ISO/IEC 14443: Identification Cards &mdash; Contactless Integrated Circuit Cards &mdash; Proximity cards (not available online).

Overview
ISO/IEC 14443 describes the standards for "proximity" cards. Specifically, it establishes standards for the physical characteristics, radio frequency power and signal interface, and anticollision and transmission protocol for proximity cards that operate within 10 centimeters (3.94 inches).

Source

 * Government Smart Card Handbook, at 31.