Octa-

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.BIPM - Résolution 4 de la 19e CGPM
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.
== Sources ==
Category:Prefixes
Category:Rare prefixes
Category:SI prefixes