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 (lowercase) and represent 10⁻²⁷, that is, one rv would be one 1,000,000,000,000,000,000,000,000,000th of a volt.
In the same proposal: quecca-, ronna-, 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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Last revised: 6 March 2019.