Specific units of IEC 60027-2 A.2 and ISO/IEC 80000 IEC prefix Representations Customary prefix Name Symbol Base 2 Base 1024 Value Base 10 Name Symbol kibi Ki 210 10241 1024 ≈ 1.02×103 kilo k[13] or K mebi Mi 220 10242 1048576 ≈ 1.05×106 mega M gibi Gi 230 10243 1073741824 ≈ 1.07×109 giga G tebi Ti 240 10244 1099511627776 ≈ 1.10×1012 tera T pebi Pi 250 10245 1125899906842624 ≈ 1.13×1015 peta P exbi Ei 260 10246 1152921504606846976 ≈ 1.15×1018 exa E zebi Zi 270 10247 1180591620717411303424 ≈ 1.18×1021 zetta Z yobi Yi 280 10248 1208925819614629174706176 ≈ 1.21×1024 yotta Y