Vrms stands for root mean square voltage which is the effective voltage a device sees on an alternating current power supply. It’s equal to half of the peak-to-peak or RMS voltage without any regard for polarity (i.e., positive or negative). What this means, in practical terms, is that your device needs to be able to survive at variation of twice the incoming Vrms power from peak to peak without any damage occurring. So if you measure 102 volts at your wall outlet and it peaks out at 208 volts, then all your devices should be rated/tested for an input range of 112-225 Vrms (positive or negative) without issue.
The real voltage on an AC power source can be at any value between the minimum and maximum limits.
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