1.  yottabyte(n = noun.quantity) yb - a unit of information equal to 1000 zettabytes or 10^24 bytes;
is a kind of computer memory unit
has parts: zb, zettabyte

2.  yottabyte(n = noun.quantity) yb, yib, yobibyte - a unit of information equal to 1024 zebibytes or 2^80 bytes;
is a kind of computer memory unit
has parts: zb, zebibyte, zettabyte, zib