"yottabyte" in the noun sense
1. yottabyte, YB
a unit of information equal to 1000 zettabytes or 10^24 bytes
2. yottabyte, yobibyte, YB, YiB
a unit of information equal to 1024 zebibytes or 2^80 bytes
Source: WordNet® (An amazing lexical database of English)
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