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  1.                 From WordNet dictionary, version 3.0:
                

    
                
                  
    yb
n. 1. a soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime
Synonyms: ytterbium, Yb, atomic number 70
2. a unit of information equal to 1000 zettabits or 10^24 bits
Synonyms: yottabit, Ybit, Yb
3. a unit of information equal to 1000 zettabytes or 10^24 bytes
Synonyms: yottabyte, YB
4. a unit of information equal to 1024 zebibytes or 2^80 bytes
Synonyms: yottabyte, yobibyte, YB, YiB