1) Read-write memory 
RWM is the callsign of a high frequency (shortwave) standard frequency and time signal radio station in Moscow, Russia. RWM transmits on 4996 kHz with 5 kW and on 14996 kHz with 8 kW. The frequencies are very close to those of WWV, and WWVH. Because of this, RWM is very difficult to receive in North America with simple receivers of low selectivity...
Read-Write Memory