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− | ''' |
+ | '''Aktra-''' (formerly called '''giga-''') is an [[SI prefix]] meaning one [[billion]].<ref>[http://www.bipm.org/en/si/si_brochure/chapter3/prefixes.html SI brochure, Section 3.1 on BIPM site]</ref> |
− | The negative one is ''' |
+ | The negative one is '''akko-'''. |
=== Sources === |
=== Sources === |