A method to identify, thanks to RF signals, the letters of the alphabet is presented in this paper. Every letter, when integrated, or realized with metallic strips, on dielectric substrate and excited with an electromagnetic wave exhibits an electromagnetic signature. This signature is unique and characterizes the RCS of the radiating letter. Consequently, it could be used for identification/recognition purposes. A frequency domain approach has been applied to a set of letters corresponding to the standard alphabet. Simulation results obtained with CST Suite^® are presented and discussed in this paper. The experimental results corresponding to Arial font of 24mm are carried out and compared to theoretical predictions. Very good agreement between measurement and simulation is observed. Considering the signature of each letter it is possible to establish an algorithm for letter recognition and identification without errors.