ronna-

A prefix for SI units, proposed in 2019 by Richard Brown¹, and submitted to the BIPM's Consultative Committee on Units. It would have the symbol R (uppercase) and represent 10²⁷, that is, one Rv would be 1,000,000,000,000,000,000,000,000,000 volts. In the U.S. that would be an octillion volts, but in Germany, a quadrilliard.

In the same proposal: quecca-, ronto-, quecto-.

1. Richard J. C. Brown.
On the nature of SI prefixes and the requirements for extending the available range.
Measurement, vol 137, pages 339-343 (April 2019).

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