robi-

Etymology
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Prefix

 * 1) A proposed IEC prefix meaning 290 = 1,0249 = 1,237,940,039,285,380,274,899,124,224. Compare ronna-, meaning 1027 = 1,0009 = 1,000,000,000,000,000,000,000,000,000, an octillion.

Usage notes
No binary prefix equivalent has been agreed upon for ronna-.