Symbols to inform people about the presence of potentially hazardous levels of radio-frequency energy or the presence of contact current hazards in the frequency range of 3 kHz to 300 GHz are specified. Guidance is given about how these symbols should be used on warning signs and labels.
IEEE Std C95.2-1999 history
2018IEEE Std C95.2-2018 IEEE Standard for Radio-Frequency Energy and Current-Flow Symbols