yobi-

Today it means: The IEC prefix meaning 2⁸⁰ = 1,024⁸ = 1,208,925,819,614,629,174,706,176. Compare yotta-, meaning 10²⁴ = 1,000⁸ = 1,000,000,000,000,000,000,000,000, a septillion. Full definition →