From WordNet (r) 3.0 (2006):
Yb
n 1: a soft silvery metallic element; a rare earth of the
lanthanide series; it occurs in gadolinite and monazite and
xenotime [syn: ytterbium, Yb, atomic number 70]
2: a unit of information equal to 1000 zettabits or 10^24 bits
[syn: yottabit, Ybit, Yb]
3: a unit of information equal to 1000 zettabytes or 10^24 bytes
[syn: yottabyte, YB]
4: a unit of information equal to 1024 zebibytes or 2^80 bytes
[syn: yottabyte, yobibyte, YB, YiB]