Yoctodeco-

Yoctodeco (#18, abbv. yd) is a numerical prefix meaning 10-54 or septendecillionth using the short scale illion system.Tier -1 and upper Tier -2 prefixes trakaplex.wordpress.com. Retrieved 2021-08-08. The term was coined as part of Trakaplex's SI system. It was confirmed that duodeviginti had a lack of tens base so the creator went to 18-illion instead and changed the initial to an 'y' to be consistent with yocto- by means of eight, eighteen. 
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Category:Prefixes by Trakaplex
Category:Prefixes
Category:Tier -1 Prefixes