RFU stands for “Radio Frequency Unit.” It typically refers to a system or component that is designed to operate within a certain range of radio frequencies for the purpose of transmitting or receiving radio signals. RFUs can be found in various applications, such as telecommunications, broadcasting, and wireless communications. They are used in devices like radios, antennas, and transmitters, facilitating the transfer of information over the airwaves. The term can also refer to specific units used to measure the power of radio frequencies, often expressed in decibels or other units of measure. In some contexts, RFU may also refer to “Request for Unsolicited Funds” in financial transactions, but its most common usage pertains to radio and communication technology.