Octa- (from Greek octa meaning 8) was an old prefix established a few years before yotta-. It was later dropped and replaced with yotta- beacuse its symbol O could be confused with a zero.
The reciprocal of this prefix is octo- from Latin octo meaning 8. It was also removed and replaced with yocto- beacuse its symbol o could also be confused with a zero.
- ↑ https://en.wikipedia.org/wiki/Unit_prefix
- ↑ BIPM - Résolution 4 de la 19e CGPM
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