yotta-

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yotta-

pref.
1. One septillion (1024): yottahertz.
2. 1,208,925,819,614,629,174,706,176 (280): yottabyte.

[Alteration of octo- (from its representing the eighth power of a thousand).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

yotta-

a combining form used in the names of units of measure equal to one septillion of a given base unit: yottabyte.
[alter. of Greek iôta, ninth letter of the Greek alphabet (y is the second-to-last letter of the Latin alphabet)]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.