pb

a soft heavy toxic malleable metallic element; bluish white when freshly cut but tarnishes readily to dull grey; "the children were playing with lead soldiers"

a unit of information equal to 1000 terabits or 10^15 bits

a unit of information equal to 1000 terabytes or 10^15 bytes

a unit of information equal to 1024 tebibytes or 2^50 bytes